Quality Material: Made of stainless steel, rubber and plastic, which is , applicable temperature range: 33℉ to 110℉. Fits 1/2 Inch to 1 Inch 720A: this bonnet repair kit is compatible with 1/2-inch, 3/4-inch and 1-inch 720A bonnet repair kits, and compatible with for Wilkins RK1-720AB 1/2Inch - 2Inch 720A engine hood repair kit. Easy to Install: 1: close inlet and outlet shut-off valves before disassembling device; 2: remove canopy screws and canopy; 3: bleed off pressure by opening the No; 2 test knob; 4: unscrew the bonnet from the body; 5: remove the plastic washer, o-ring, spring, poppet and spider assembly; 6: after completing inspection, replace necessary parts and reassemble. You Receive: 1 x 720A pressure vacuum breaker repair kit and 1 x bonnet repair kit, including: plastic washer, O-ring, spring, poppet spider assembly, bonnet washers, bonnet O-rings, load nut rails, load washers, top plates, poppet valves, springs, spider screws, lower discs, guide spiders hex nuts, 3 canopy screws, 1 canopy, 1 bonnet, 1 bonnet gasket, and 1 bonnet O-ring. Function: the 720A series pressure vacuum circuit breaker assembly is designed to be installed on the drinking water line to prevent the water stop from backsiphonage into the drinking water supply system; Unless the ball valve or valve body itself is broken, this pressure vacuum circuit breaker repair kit repair most of the 720A PVB., Manufacturer: Akfldms