ELECTRICAL POWER CORD: 7 Way Trailer Cords are made of high-quality pure copper and have a longer service life. And with excellent conductivity and thermal conductivity to ensure the normal use of lights (such as turning signals and braking lights) during driving PREMIUM AIR HOSE: Our coiled air brake hoses are made of premium PA12 Nylon material with better quality than others. And using a three-layer integrated molding process, the air hoses have fine workmanship, uniform thickness, and high blast pressure SPRING JOINT: The two ends of the air line are protected by stainless steel spring. Springs with good elasticity can protect the wires well, and have a cushioning role when installing and using a wire DOT BRASS AIR FITTING: Our 1/2" DOT air hose fittings are made of high-quality CA360 brass, meet D.O.T. FMVSS 571.106 approved, SAE J1131 air brake system requirements, with corrosion resistance, high-temperature ductility, low permeability and long service life REPLACEMENT: The air hose can be used as a replacement for Tectran 17215, for Phillips 11-315, for Tremec Sloan 451036N, etc. The electric power cord can be used as a replacement for Philips 30-4621, for Velvac 590161, for PDC EL27715, for Tectran 7ATG522MG, for Tremec 4D015, for Sloan 421130, etc. Our air hoses and power wires are designed and manufactured according to OEM standards, air hoses meet SAE J844 and power wires meet SAE J2394. And the price is only a small part of the dealer CheeMuii 15Ft Coiled Air Brake Hoses & ABS Electrical Power Wire Assembly Kit 3 in 1 Semi Truck Air Lines Kit Coiled 7 Way Trailer Cord and Air Brake Hoses for Semi Trucks Trailers Tractors