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DOT Air Fittings

Composite DOT air line fittings are easy to assemble and disassemble, resist mechanical pull-out, and meet all guidelines set by the US Department of Transportation (DOT) and the Society of Automotive Engineers (SAE) for automotive components. As your leading supplier of pneumatic parts and DOT fittings, Polyconn is ready to tackle most orders. Our standard composite DOT air fittings are designed for easy installation in most vehicle pneumatic systems and offer:




  • Compliance with DOT FMVSS 571 for Air Brake Performance requirements
  • Ability to be used with SAE J844 tubing
  • Composite body with a brass thread for high-quality connections
  • -40°F - 140°F (-40°C - 60°C) temperature range
  • 0 to 145 PSI pressure range
  • And much more!

Explore our extensive catalog for more information about our composite DOT fittings for pneumatic systems. Contact us for more information or assistance sorting a non-standard or unlisted fitting. Our expert team will get to know your project’s parameters and recommend your best solution.


DOT Air Brake Line Fittings to Match Your Specifications

Polyconn is committed to meeting every requirement for your pneumatic system. We supply a variety of DOT fittings and parts, including DOT brass fittings, DOT nylon tube, and more. Our composite DOT air line fittings are built to offer long-lasting performances and are available in a variety of configurations to match the needs of your truck, trailer, mobile vehicle, or other transportation assembly:
  • Union and Male Y DOT Fittings
  • Male Elbow 45° or Elbow Swivel DOT Fittings
  • Union Tube, Tee, Bulkhead, and Elbow DOT Fittings
  • DOT Female or Male Connectors
  • Female Elbow DOT Fittings
  • Male Tee Run or Branch DOT Fittings
  • Male or Female Branch Tee DOT Fittings
  • Female Bulkhead DOT Fittings
  • Elbow Stem DOT Fittings
Do you require a composite DOT fitting that is not listed in our catalog? No problem. Polyconn has a vast network of partners, and we can source DOT air line fittings that match the needs of your pneumatic system. Call 763-559-0388 to speak with a representative directly and explore your options.

Uses for Composite Air Line Fittings

DOT fittings are available for a variety of transportation assemblies, including components in heavy-duty trucks and semi-trucks, trailers, railway vehicles, mobile vehicles, and other transportation assemblies:
  • Air brake connections
  • Automatic windows, wipers, and adjustable mirrors
  • Cab controls
  • Air-operated seats
  • Operating gauges
  • Heater and air conditioning controls
  • Gear shifts
  • And much more!

How Composite DOT Air Fittings Benefit Air Brakes & Other Systems

DOT air line fittings add many advantages to most assemblies. Exact benefits can vary depending on your intended use but can include:
  • Strong and lightweight constructions
  • Impact and corrosion resistance
  • Innovative collet design to provide an excellent grip
  • Quick to install in semi-trucks, buses, trailers, and more
  • Straightforward disconnect capabilities
  • Comprehensive leak-proof connections
  • And many other benefits!

How to Install DOT Air Fittings

Push-to-connect DOT air fittings are engineered for straightforward installation for air brake lines, pneumatic systems, and more. Use these steps while assembling your pneumatic system:
  1. Cut tubing squarely with an allowable maximum of 15°.
  2. Check the mating part’s port and clean if necessary.
  3. Insert the tubing into the fitting until it bottoms, pushing at least twice to verify the tube is inserted past the collet and O-ring.
  4. Pull on the tubing to verify that it is securely inserted.

Polyconn is Your Go-To Resource for DOT Fittings & Other Pneumatic Components

Polyconn has supplied OEMs, MROs, and distributors with the best pneumatic fittings on the market for over 40 years. Our continuous commitment to excellent service, high-quality products, and providing comprehensive pneumatic knowledge make us your best option for your DOT-approved assembly. Contact us to learn more about how we can support your business and improve your pneumatic operations.