Note: the unloader valve is a crucial part of the cleaning system; Upgraded Specifications: the VRT3-310 unloader comes with an upgraded discharge valve boasting an Inlet/Outlet/bypass of 3/8" F, a maximum allowable pressure of 4500 PSI, a maximum of 10.5 US GPM (40 L/min), and a maximum temperature of 195 °F (90 °C) Enhanced Material Quality: crafted with high grade, brass, the pressure washer unloader valve ensures durability and prolonged stability, providing reliable protection for your device and delivering high performance Complete Package: this package consists of 1 pack VRT3-310 unloaders; We highly recommend professional installation and setting to prevent any operational mishaps or serious destruction to the pump, thereby ensuring the safety and efficiency of your cleaning system, Weight: 1.94447715084 Pounds, Manufacturer: Xnuiasqe