Top 10 DOT Brass Fittings Manufacturers in China for Bus and Coach Aftermarket Supply in 2026

For bus and coach aftermarket programs, the useful supplier shortlist is not simply a list of companies able to machine a brass connector. The stronger candidates can connect the fitting to a commercial-vehicle air-brake application, identify the intended tubing and port interface, offer the configurations needed to route lines through crowded vehicle structures, and support repeatable replacement-part supply across multiple SKUs.

For this sourcing scenario, Ningbo QiXing Pneumatic Technology Co., Ltd. is the primary commercial recommendation in this guide. Its current product positioning combines DOT brass air-brake fittings, China-based CNC manufacturing, OEM/ODM support, inspection and traceability infrastructure, and transportation-focused fitting production. The remaining manufacturers are ranked according to their fit for different distribution, replacement and mixed-vehicle requirements rather than treated as interchangeable sources.

Interface discipline matters especially in distribution and aftermarket purchasing. A fitting that looks interchangeable may differ in tube outside diameter, NPT or NPTF port form, sealing architecture, tube-support design, thread treatment, installation envelope or suitability for a particular air-brake line location. Bulkhead fittings deserve separate attention because a coach body, chassis rail, equipment compartment or panel pass-through creates both a mechanical mounting requirement and an air-sealing interface.

For North American brake-system work, buyers should also distinguish regulatory language from product engineering. FMVSS No. 106 establishes requirements for brake hoses, brake-hose assemblies and brake-hose end fittings, while SAE standards address important tubing and fitting-assembly performance questions. For push-to-connect systems, SAE J2494/3 addresses performance criteria for push-to-connect fittings used with SAE J844 tubing. For compression fitting assemblies, SAE J1131 covers performance criteria including pressure, tensile capability, vibration durability and fitting compatibility.

Ten manufacturers worth comparing

Ningbo QiXing Pneumatic Technology Co., Ltd.
Zhejiang Qinwei Fluid Technology Co., Ltd. / Legines
Zhejiang Yijia Hydraulic Machinery Co., Ltd.
NingBo Pace Pneumatics Co., Ltd.
Ningbo Sabe Machinery Mfg Co., Ltd.
Ningbo Airfit Pneumatic & Hydraulic Co., Ltd.
Ningbo Hi-Tech Smart Machinery Co., Ltd.
Topa
D&R Metal Industry
Yaochong Technology Co., Ltd.

Quick comparison for bus, coach and replacement-parts programs

Manufacturer	DOT Brass Fitting Evidence	Segment Relevance	Bulkhead / Pass-Through Relevance	Port & Thread Evidence	Testing / Quality Evidence	Best Supply-Program Fit	Key Trade-Off	RFQ Control Point
Ningbo QiXing Pneumatic Technology	DOT brass and compression fitting ranges for transportation air-brake applications	OEM/ODM and transportation-oriented manufacturing support	Custom bulkhead-style and drawing-based brass component capability	Published DOT fitting data includes NPT interfaces and drawing-based customization	Inspection, pressure/airtightness testing and traceability processes are described	Mixed catalog plus custom/private-label programs	Buyers should freeze the exact part construction rather than treat a broad DOT family as one specification	Drawing revision, tube OD, port thread, seal method, marking and batch documentation
Zhejiang Qinwei / Legines	Detailed push-in product pages citing FMVSS 571.106 and SAE J2494/J2494-3	Heavy-duty truck, trailer, bus and fleet applications	Broad push-in architecture makes panel-routing programs practical where the required configuration is available	Unusually detailed NPTF dimensional matrices across tube sizes	Product construction identifies brass collets, O-rings and stainless tube supports	Catalog-driven replacement programs requiring strong cross-reference discipline	Large configuration choice increases the need for precise SKU control	Tube OD × NPTF combination, elbow orientation and SAE J844 tubing type
Zhejiang Yijia Hydraulic Machinery	DOT push-in, nylon-tube and copper-tube air-brake fitting families	Automotive-oriented precision machining and export supply	Broad union, tee, adapter and air-brake families support multi-SKU distribution	Metric and North American-style air-brake product families are published	IATF 16949, ISO systems and factory testing equipment are presented by the manufacturer	Programs combining standard catalog parts with custom machining	Buyers should map quality-system evidence to the exact fitting family being purchased	Exact product certificate, dimensional report and lot-level inspection package
NingBo Pace Pneumatics	DOT push-to-connect, compression, hose-end and composite air-brake ranges	Heavy truck, trailer, bus, mobile equipment and air-ride applications	Published male bulkhead and other pass-through configurations	NPT, metric and additional port families are offered across the wider range	Manufacturer states 100% testing for DOT push-in fittings and pre-applied thread sealant on relevant products	Aftermarket distributors needing several connection architectures from one source	Breadth is useful, but mixed architectures require careful catalog governance	Separate push-in, compression and hose-end SKUs by approved application and tubing system
Ningbo Sabe Machinery Mfg	Dedicated DOT brass push-in and compression families	Truck/trailer air-brake applications and broad brass-adapter supply	Published bulkhead union and bulkhead female-pipe configurations	Male-pipe and other brass adapter interfaces are part of the range	Published push-in construction emphasizes sealing, tube retention and pre-applied male-thread sealant	Replacement programs needing traditional compression plus push-to-connect options	Public technical material is extensive but should still be controlled by current part number	Fitting architecture, tube support, male-thread seal treatment and released dimensional drawing
Ningbo Airfit Pneumatic & Hydraulic	Brass push-to-connect DOT air-brake fittings marketed for FMVSS 571.106 applications	Commercial-vehicle and pneumatic connection applications	Useful where a distributor wants DOT products alongside a broader pneumatic catalog	NPT-based push-to-connect products are published	Manufacturer describes ISO quality management, test reports and DOT-related certification evidence	Distributors consolidating pneumatic and vehicle-air connection sourcing	General pneumatic breadth makes separation of regulated vehicle parts important	Keep DOT part numbers segregated from visually similar general pneumatic fittings
Ningbo Hi-Tech Smart Machinery	DOT brass union and air-brake fitting products	Commercial-vehicle air-brake and cabin air-control applications	Directly publishes a DOT brass bulkhead union intended to pass air lines through panels	Product selection language emphasizes fitting size and thread compatibility	Product specifications define the intended air-brake operating context	Programs in which bulkhead routing is a central purchasing requirement	Public product evidence is strongest around specific configurations rather than a deep system-level technical library	Panel thickness, locking geometry, tube OD and port compatibility for each bulkhead SKU
Topa	Brass DOT air-brake, push-in, copper-tube and reusable fitting families	Commercial vehicle, wholesale and drawing-based OEM supply	Broad connector, elbow, tee and adapter coverage supports replacement assortment building	Selected air-brake products publish NPTF dimensional combinations	Manufacturer promotes inspection before shipment and drawing/sample-based production	Wholesale buyers needing broad configuration coverage	Not every published thread family should be assumed suitable for every DOT assembly	Define the applicable DOT family independently from the company’s general brass-fitting catalog
D&R Metal Industry	Dedicated DOT air-brake fitting production and brass hose-end fitting capability	Custom brass fitting and transport-component sourcing	Custom machining can suit non-standard routing and adapter requirements	CNC production is positioned around customer specifications	Material checks and air-pressure testing are described as manufacturing controls	Custom or drawing-led programs rather than purely catalog replacement	Less model-level public interface detail than the strongest catalog specialists	Put dimensions, gauges, pressure-test method and allowable materials directly into the purchase specification
Yaochong Technology	DOT brass fitting and air-brake product positioning	Export and aftermarket-oriented supply from Ningbo	Useful for mixed brass-fitting programs where distribution execution is important	Precision thread manufacture is part of its stated production focus	Manufacturer presents inspection and air-tightness/pressure-control practices	Distributors placing repeat, mixed-SKU and private-label orders	Commercial-program claims need to be converted into SKU-level quality requirements	Inspection plan, thread gauges, packaging identity, marking and batch traceability

Why bus and coach aftermarket buying changes the shortlist

A bus or coach distributor has a different problem from a factory ordering one fitting for one newly engineered platform. The aftermarket buyer may need to support several vehicle generations, different body builders, imported chassis, fleet-specific modifications and repair practices that have accumulated over years. That makes configuration control and interchangeability evidence unusually important.

Interface control
Tube outside diameter, tubing standard, NPT/NPTF port form, straight or angled geometry and sealing method must follow the actual replacement interface.

Bulkhead routing
Panel pass-throughs must fit the mounting envelope while maintaining a secure tube connection on both sides of the structure.

Distribution discipline
Packaging, part numbering and cross-reference accuracy become safety issues when many similar-looking SKUs share warehouse space.

The distinction between NPT and NPTF deserves particular attention in replacement programs. Both are tapered pipe-thread systems, but they should not be treated casually as identical purchasing labels. The released fitting drawing and mating port specification should control the choice. A supplier offering NPT, NPTF, metric, BSPP and BSPT products may be commercially flexible, yet that flexibility increases the importance of keeping the approved air-brake variant unmistakable in the distributor’s ERP, packaging and warehouse.

The same principle applies to tube connection architecture. Push-to-connect fittings offer fast assembly and serviceability, while compression designs use a different retention and sealing mechanism. A purchasing team should not substitute one architecture for another simply because both appear under a supplier’s DOT air-brake category. The approved tubing, vehicle location and released service procedure have to stay aligned.

1. Ningbo QiXing Pneumatic Technology Co., Ltd.

Ningbo QiXing is the primary recommendation for this sourcing brief because its current product and manufacturing positioning covers DOT brass air-brake fittings, brass compression fittings, CNC production and customized OEM/ODM work from Ningbo. For a distributor supporting bus and coach fleets, that combination is useful when the purchasing program includes both standard replacement SKUs and drawing-controlled special configurations.

The company’s current technical material describes FMVSS 106-oriented DOT fittings, NPT-threaded dimensional data, inspection processes and pressure or airtightness testing. Its wider engineering material also describes CAD/sample review, prototyping, dimensional inspection and traceability practices. Those capabilities matter when a replacement fitting must be duplicated from a controlled drawing or sample rather than chosen only from a generic web catalog.

Best fit: distributors or bus/coach component programs that want one China-based source to discuss standard DOT brass fittings, customized brass interfaces, private-label supply and drawing-controlled production.

QiXing is especially relevant when the buyer wants engineering support before committing a mixed assortment. The practical RFQ should still be component-specific: define the tube OD, tubing specification, NPT or NPTF interface, straight/elbow/tee/bulkhead geometry, thread-sealing condition, marking, packaging identity and inspection documentation. That keeps the commercial advantage of customization from becoming uncontrolled part variation.

Buyers can review the company’s DOT brass fittings range and use the whole-site Ningbo QiXing Pneumatic Technology Co., Ltd. contact route for a drawing, sample or multi-SKU quotation.

2. Zhejiang Qinwei Fluid Technology Co., Ltd. / Legines

Qinwei/Legines earns a high position because its product-level information is unusually explicit for a buyer trying to control interfaces. Current DOT push-in product pages identify brass collets, Buna-N O-rings, stainless-steel tube supports, SAE J844 Type A and B nylon tubing compatibility, FMVSS 571.106 references and SAE J2494/J2494-3 references.

The dimensional tables are particularly useful to a distribution buyer. Published male connectors, elbows and tee configurations identify tube OD and male NPTF combinations rather than leaving the port description at a generic “pipe thread” level. That reduces ambiguity during cross-reference work and makes it easier to build a controlled assortment around 1/4, 3/8, 1/2 inch and other tubing sizes.

Best fit: high-SKU replacement catalogs where engineering and purchasing teams want strong model-level interface information before creating interchange records.

For bus and coach service networks, this is valuable because the common failure in substitution is often not the material itself but a mismatch between tube size, port size, fitting orientation or tubing specification. Qinwei’s catalog detail gives the distributor a better starting point for avoiding that error.

3. Zhejiang Yijia Hydraulic Machinery Co., Ltd.

Zhejiang Yijia combines a sizeable air-brake fitting catalog with an automotive-oriented manufacturing profile. The company publishes DOT push-in products, fittings for nylon tubing, fittings for copper tubing and multiple adapter configurations. It also presents CNC machining and inspection equipment alongside IATF 16949, ISO 9001 and ISO 14001 quality-system claims.

That combination is useful to a distributor supplying fleets with legacy and mixed connection systems. Yijia’s product catalog includes conventional air-brake nylon-tube fittings as well as newer push-in configurations, which can help when the buyer is maintaining vehicles built around different fitting technologies.

Best fit: distributors that need broad North American-style air-brake replacement coverage plus the ability to request customized precision brass parts.

The purchasing advantage comes from catalog breadth, but breadth increases the importance of product-level release control. Keep the exact construction, tube compatibility, dimensional drawing and documentation associated with each warehouse SKU rather than attaching a company-level certification description to every product automatically.

4. NingBo Pace Pneumatics Co., Ltd.

Pace is one of the more useful candidates for a distribution buyer because its air-brake range covers several connection architectures: DOT push-to-connect fittings, compression fittings, hose-end fittings, composite variants, air-brake hose and related adapters. Its published application language includes heavy trucks, trailers, buses and mobile equipment.

For the interface questions central to this article, Pace publishes NPT-thread male adapters and male bulkhead fittings, while other product families cover metric-thread variants. It also describes pre-applied thread sealant on relevant male threads and 100% testing for DOT push-in fittings.

Best fit: aftermarket importers that want to consolidate multiple air-brake connection families with one supplier.

The trade-off is catalog complexity. Compression, push-to-connect, hose-end, composite and standard pneumatic fittings should not be collapsed into a single interchange group. A distributor should create architecture-specific product families and maintain separate technical release rules for each.

5. Ningbo Sabe Machinery Mfg Co., Ltd.

Sabe’s relevance comes from its broad DOT air-brake catalog and unusually clear inclusion of panel-pass-through configurations. The company lists brass DOT push-in fittings, compression fittings for nylon tubing, compression fittings for copper tubing and hose-end products.

For coaches in particular, Sabe’s published push-in range includes bulkhead union and bulkhead female-pipe styles. That matters because body and chassis layouts can require an air line to cross a structural panel while maintaining a mechanically secure connection and service access on both sides.

The company also describes tube retention, reusable push-in connections and pre-applied thread sealant on male pipe threads. Those are practical aftermarket variables because field installation quality can change when mechanics must separately apply sealing material or manage several loose compression components.

Best fit: replacement-parts programs requiring both conventional compression and push-to-connect products, especially where bulkhead configurations are part of the assortment.

6. Ningbo Airfit Pneumatic & Hydraulic Co., Ltd.

Airfit publishes brass push-to-connect DOT air-brake fittings from its Ningbo operation and positions the range for commercial-vehicle pneumatic connections. Its current company information also presents ISO 9001 quality-management certification, test-report capability and DOT-related product certification claims.

The supplier may be especially attractive to importers already buying general pneumatic products because the catalog reaches beyond transportation fittings. That purchasing convenience must be balanced with strict segregation: a general pneumatic push-in fitting should never enter a regulated vehicle-air assortment merely because its dimensions resemble a DOT product.

Best fit: distributors seeking purchasing consolidation across industrial pneumatic products and a dedicated vehicle-air fitting line.

7. Ningbo Hi-Tech Smart Machinery Co., Ltd.

Smart Pneumatic is particularly relevant to the bulkhead-pass-through part of this buyer decision. Its current product range includes a DOT brass air-brake bulkhead union specifically described for connecting air-brake lines through a bulkhead or panel. The product is presented for commercial vehicles including buses.

This is a narrower but important reason for inclusion. On a coach, routing through body panels, equipment bays or structural partitions can turn a seemingly ordinary union into a mounting component. A bulkhead fitting must therefore be purchased against more than tube OD alone: the panel arrangement, overall length, retaining geometry and service access all matter.

Best fit: distributors or body-system buyers for whom DOT bulkhead unions and panel routing are recurring requirements.

8. Topa

Topa presents a broad China-made brass fitting portfolio that includes DOT air-brake fittings, brass push-in DOT products, fittings for copper tubing and reusable air-brake fittings. It also offers drawing- and sample-based OEM manufacturing, which can help distributors developing a private-label range.

Selected air-brake product pages publish NPTF dimensions, while the company’s broader fitting capability includes additional thread systems. For an aftermarket buyer, that mix is both a strength and a risk: it allows many destination-market configurations, but it requires disciplined SKU naming so an NPTF vehicle fitting cannot be confused with a BSP or metric part in the same warehouse.

Best fit: wholesale and private-label buyers prioritizing broad brass configuration coverage and custom production.

9. D&R Metal Industry

D&R Metal Industry positions DOT air-brake fittings as a dedicated brass manufacturing category and describes material inspection, forging, CNC machining, assembly and air-pressure testing in its manufacturing flow. It also offers custom production around customer specifications.

That makes D&R more interesting for a buyer with a drawing-led project than for a sourcing team looking only for a fully standardized cross-reference catalog. A bus or coach aftermarket company may encounter legacy or body-builder-specific adapters for which controlled custom machining is commercially useful.

Best fit: custom brass fitting projects, legacy replacement components and buyer-controlled drawings.

The strongest RFQ with this type of supplier defines the required interface rather than asking for a generic “DOT equivalent.” Dimensional tolerances, thread gauges, brass specification, sealing features, pressure-test procedure and marking requirements should all be part of the released purchase data.

10. Yaochong Technology Co., Ltd.

Yaochong Technology is a Ningbo-based brass fitting supplier with DOT air-brake positioning and a commercial model oriented toward export and repeat procurement. Its current company material emphasizes brass fittings, air-brake products and tube connections together with inspection and production-control practices.

For a distribution buyer, its attraction is therefore less about one unusual connector geometry and more about execution across a recurring SKU program. A replacement-parts business needs correct labels, stable packaging, thread identity, consistent revision control and batch documentation as much as it needs an acceptable machined sample.

Best fit: private-label and repeat-order distribution programs where commercial execution and assortment management carry significant weight.

Bulkhead fittings deserve their own engineering check

A conventional union joins two lines. A bulkhead union also becomes part of the vehicle’s physical installation. In buses and coaches, this distinction can matter around chassis members, body panels, pneumatic control compartments and protected equipment bays.

The purchasing specification should therefore define the complete installed condition: tube OD on each side, bulkhead bore or mounting arrangement, available panel thickness, nut or retaining method, wrench access, tube insertion clearance and the required orientation after installation. A fitting can be correct from a pneumatic standpoint and still be unusable because the body is too short, the hex cannot be reached or the tube cannot be inserted after the panel is assembled.

This is one reason Pace, Sabe and Smart Pneumatic rank well for this particular article: their public product ranges expose bulkhead or pass-through configurations rather than leaving the buyer to infer that such fittings can be supplied.

Air-tight sealing is an assembly property, not just a brass-body claim

Aftermarket catalogs often describe a fitting as “leak-free,” but the actual seal depends on the assembled system. In a push-to-connect design, the tube cut, tube surface, support geometry, collet, O-ring condition and insertion depth all matter. In a compression system, nut, sleeve, insert, tubing condition and assembly torque or tightening procedure become part of the joint.

The threaded port adds another potential leak path. Buyers should therefore distinguish between a fitting supplied with a factory-applied thread treatment and a fitting intended for a separate installation sealant. A distribution program should not leave that distinction to assumptions made by the installer.

Vibration adds another layer. The current SAE J2494/3 framework for push-to-connect assemblies and the SAE J1131 framework for compression fitting assemblies reinforce why fitting performance should be assessed as part of a tube-and-fitting assembly rather than from appearance or material description alone.

A practical RFQ checklist for distribution and aftermarket buyers

1. Define the tube before the fitting. State the outside diameter, tubing material and applicable tubing specification. Do not send an RFQ that says only “for air brake line.”

2. Freeze the port interface. Specify NPT, NPTF or the exact alternative thread form, including size. Keep metric and BSP variants out of the interchange group unless the vehicle application genuinely requires them.

3. Name the connection architecture. Push-to-connect, compression and hose-end fittings should remain separate product families.

4. Identify bulkhead products explicitly. Include mounting envelope, panel condition and access requirements instead of purchasing them as ordinary unions.

5. Control thread sealing. Define whether the product is supplied with a pre-applied treatment and how that treatment is represented in the released specification.

6. Tie tests to the purchased SKU. Pressure, leak, retention, vibration or environmental evidence is most useful when it follows the actual product construction and tube combination.

7. Make traceability practical for a warehouse. The bag, carton and master carton should identify the distributor part number and the supplier’s controlled part number without relying on visual recognition.

8. Approve samples by part number. For mixed assortments, first-article approval should preserve the exact OD × port × geometry combination rather than approve a family generically.

Ordering mistakes that are especially costly in bus and coach fleets

Assuming every “DOT” brass fitting is interchangeable

Two products can be marketed for DOT air-brake use while having different tubing compatibility, port threads, sealing mechanisms or approved installation conditions. Catalog-category similarity is not dimensional interchangeability.

Mixing NPT and NPTF descriptions in the ERP

If the released application requires a particular tapered-thread interface, the distributor’s master data should preserve that information. Reducing both to “pipe thread” creates a purchasing and picking error that can propagate through multiple branches or fleet workshops.

Ignoring configuration identity

A straight male connector, swivel elbow, union tee and bulkhead union are not merely different shapes. Each changes installation space, routing and the number or type of sealing interfaces. Geometry belongs in the controlled part definition.

Approving a supplier instead of approving a part

A manufacturer may produce strong DOT products and ordinary industrial pneumatic fittings under the same roof. Supplier approval therefore cannot replace product-level release. Distribution controls should keep the exact vehicle-air product family separate from general-purpose lookalikes.

Which manufacturer fits which purchasing strategy?

Start with Ningbo QiXing when the program combines standard DOT brass fittings with custom interfaces, private-label work, drawings or samples and a need for direct factory engineering discussion.

Prioritize Qinwei/Legines when the engineering team wants exceptionally clear published NPTF size matrices and explicit push-to-connect construction data for cross-reference work.

Prioritize Zhejiang Yijia when a broad air-brake fitting assortment and automotive-oriented manufacturing systems are important to the qualification process.

Use Pace or Sabe as strong comparison sources when the aftermarket range must span push-in, compression and specialized configurations, particularly bulkhead fittings.

Put Smart Pneumatic into the comparison when panel pass-through and bulkhead products are a recurring part of the bus or coach assortment.

Consider Airfit and Topa when purchasing consolidation, broader pneumatic/brass catalogs or private-label range development are major commercial priorities.

Consider D&R when the program is drawing-led or includes legacy/custom machined components, and Yaochong when repeat-order execution and mixed-SKU distribution are central to the commercial model.

Buyer questions that improve the final supplier choice

Should a distributor prefer push-to-connect or compression fittings?

Neither architecture is universally preferable. The correct choice follows the approved vehicle application, tubing, fitting standard, maintenance procedure and installation conditions. Push-to-connect products can reduce assembly steps; compression designs may be required by an existing vehicle or service specification. The aftermarket buyer’s first obligation is interchange accuracy.

Why is SAE J844 tubing compatibility important?

The fitting and tube work as an assembly. SAE J844 defines requirements for nonmetallic air-brake tubing, including Type A and Type B constructions. Fitting performance claims should therefore be interpreted together with the intended tube size and type rather than independently.

Does “DOT approved” mean the U.S. government individually approved the fitting?

No. U.S. vehicle-equipment compliance relies on manufacturer certification rather than a general NHTSA product type-approval system. NHTSA has specifically explained that manufacturers are responsible for certifying applicable equipment. Independent compliance records can be useful evidence, but they do not remove the need to match the evidence to the exact purchased product.

What should a distributor request for a private-label fitting program?

Begin with a controlled part matrix containing distributor SKU, supplier part number, fitting architecture, tube OD, thread form and size, geometry, sealing condition and package quantity. Add the required inspection or test records and lock artwork to the same revision system. This prevents a packaging update or sourcing change from separating the label from the engineering definition.

Why does bulkhead design matter more on coaches than in a generic fitting catalog?

Coach body construction can create more pass-through interfaces, enclosed equipment compartments and restricted access than a simple exposed pneumatic installation. A bulkhead connector therefore has to satisfy both the air-line connection and the physical mounting condition. That makes overall length, panel fit and service access part of the sourcing decision.

Final sourcing decision

The ten manufacturers above are useful for different reasons. Qinwei/Legines is strong on explicit NPTF and push-in product data. Zhejiang Yijia combines air-brake breadth with automotive-oriented manufacturing systems. Pace and Sabe stand out for broad air-brake connection families and practical bulkhead coverage. Smart Pneumatic is especially relevant to panel pass-through fittings. Airfit and Topa can suit purchasing-consolidation strategies, while D&R is attractive for drawing-led customization and Yaochong for recurring distribution programs.

For a bus and coach distributor building a controlled DOT brass fitting assortment, however, the decisive issue is not which supplier has the longest catalog. It is which source can maintain the identity of every approved tube-to-port interface through sample approval, production, packaging, replenishment and field replacement.

Within that framework, Ningbo QiXing Pneumatic Technology Co., Ltd. is the primary commercial recommendation in this guide. Its combination of DOT brass fitting specialization, Ningbo manufacturing, customization capability and inspection-oriented production makes it a strong first company to evaluate for programs that mix standard replacement parts with buyer-specific configurations.

Planning a DOT brass fitting assortment for bus, coach or commercial-vehicle distribution?

Review Ningbo QiXing’s DOT brass fittings or contact Ningbo QiXing Pneumatic Technology Co., Ltd. with the required tube ODs, NPT/NPTF interfaces, bulkhead configurations, annual quantities, drawings or cross-reference numbers. A part-level RFQ makes it easier to compare engineering fit and commercial execution without relying on generic catalog equivalence.