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Hoseandfittings.com Sells a Wide Range of Brass Air Hose Fittings Approved by the Department of Transportation for Use on Trucks and Trailers.  
DOT Brass Air Brake Connectors and Accessories are Used to Connect Brake Lines in Vehicles and Machinery. Do NOT Substitute Regular Compression Fittings for DOT Compression Fittings. When You Press Your Brake Pedal the PSI (pounds per square inch) Exerted on your Brake System is Great Often Over 1,000 PSI in Normal Braking. Always Use DOT APPROVED Fittings.

There are Many Applications for Department of Transportation (DOT) Approved Fittings on Trucks and Trailers, but the Most Common is for Air Brake Lines and Transmissions. We Offer Both DOT Approved Push-to-Connect and DOT Compression Fittings.

When Choosing Between DOT-Approved Push-to-Connect or Compression Fittings You can use These Differences To Decide Which one You Would like to Order.  DOT-Approved Push-to-Connect Air Brake Fittings are Compact and Better Suited for Installing in Confined Areas. Compression Fittings must be Installed with Tools, Where Push-to-Connect Fittings are Installed and Removed by Using Tools Only on the Pipe Thread Ends, not the Tube Ends, Saving Time and Reducing the Possibility of Causing Damage to Surrounding Components or Equipment.
Leak-Free Seals are Easily Achieved Using DOT-Approved Push-to-Connect Air Brake Fittings by Easily Pushing the Fitting onto the Tube or Hose. The Nut on a Compression Fitting Must be Turned to Specifically Rated Torque to Ensure the Proper Seal, Whereas Push-to-Connect Fittings do not Have a Compression Nut.
Push-to-Connect Fittings Rarely Require Adjusting After Installation to be Leak Free, Whereas Compression Fittings Often Need to be Retightened to Stop a Leak. This Can Cause Crimping or Distortion of the Tube, Increasing the Chance of Future Leaks.
DOT Push-to-Connect Air Brake Fittings are Made to be Easy to Assemble and Disassemble, with No Tools or Skills Required. They May be Used for All Air Brake Applications Except Those Designed for Use Between Frame and Axle or Between Towed and Towing Vehicles.