Brass and Composite Push-to-Connect air brake fittings are designed to resist mechanical pull-out are easy to assemble and disassemble over and over again. They are designed for use with SAE J844 air brake tubing. Max working pressure is 145 PSI with a temperature range of -40 F/C to 225 F. Tramec Sloan Push-to-Connect fittings meet DOT FMVSS 571.106, SAE J1131, J2494-1, and J2494-3 standards. From under the hood, to the back of the trailer...We've got you covered!