Recommended for air brake systems ? compressed air connectors or suspension, steering, engine transmission or other onboard vehicle applications. Not for fuel, oil or water. Easy to assemble, push to connect, one piece fitting. Reusable and field serviceable. Designed for strength and durability. Provides significant reduction in air system leakage. Meets DOT FMVSS 571.106, SAE J1131, DIN 74324 and German TUV requirements. For use with SAE J844 or DIN 74324 nylon tubing. Temperature Range: -40 Deg. F to +200 Deg. F (-40 Deg. C to +93 Deg. C).