High pressure ball valve has 3/8'' quick connector and 3/8'' quick connect plug. Easy to connect ball valve to gun, nozzle, pump and hose. The steel pressure washing ball valve kit is designed for pressure washer hose. The max working pressure is 4500 PSI. The ball valve is easy to turn on and off. It offers great leverage under high pressure. Quick Disconnect Fitting: 3/8'' quick coupler plug + 3/8'' male NPT thread; 3/8'' quick coupler socket + 3/8'' male NPT thread.