Brass Push>Connect Air Brake Tube Fitting, 0.25 Inch Tube OD Union Tee

For typical air brake system operation, 150 psi handles the range you'd run into on most commercial equipment. The fitting also meets D.O.T. FMVSS 571.106 and SAE J1131 air brake system performance requirements, so it's been validated specifically for that kind of service, not just rated to a generic pressure number. Vacuum to 150 psi covers both sides of the spectrum, including any low-pressure or suction-side situations you might encounter in the same system.

This fitting meets D.O.T. FMVSS 571.106 and SAE J1131 air brake system performance requirements, so it should be suitable for your application, provided you're using 0.25-inch OD tubing.

For 0.25 inch tube OD, you insert the tubing straight into the fitting until you feel a solid stop, then give it a gentle tug to confirm it is grabbed. The seal is made with an EP (Ethylene Propylene) O-ring, and the fitting is built for quick assembly.