Durable Material: Crafted from high-quality brass, our air hose fittings are exceptionally durable and have a long lifespan, making them reliable for various air brake systems DOT Compliance: DOT air brake hose ends sleeves are made of high-quality CA360 brass, meets D.O.T. FMVSS 571.106 approved, SAE J1402 air brake system requirements Exceptional Sealing Performance: Precision engineering guarantees outstanding sealing performance, effectively preventing gas leaks, enhancing system efficiency, and reducing energy wastage Wear and Corrosion Resistant: the brass construction of the fittings has excellent corrosion durability and can withstand harsh environmental conditions. It ensures system reliability and stability even in challenging situations Application: Our air brake hose fitting is suitable for various air brake systems, including trucks, trailers, and other commercial vehicles. They can work normally even if air pressure reaches up to 300PSI. Our quick connect hose fittings, air compressor fittings, air tool fittings, air line quick connect fittings, and air line fittings are perfect for industrial use or trucks trailers HASAOMOI Brass 2PCS 1/2” OD Union Tube with 4 PCS Fitting Sleeve Tube, Air Brake Hose Fittings for Air Brake Systems,perfect for industrial use or trucks trailers