Pressure washer fittings are used for gasoline and electric power washer connections. They make your cleaning job easier and faster. Made of stainless steel and chromed brass. High build quality ensures long life.3/8 Inch quick connect fittings are great for snap. Very smooth to couple and uncouple. 3/8 Inch NPT male thread fittings are well made. Advanced technology to ensure the high precision of thread and no leakage.Chemical injector kit with a metering valve, which can adjust dilution ratio of soap and water. Avoid clogging of the injector and improve the efficiency of pressure washer. When detergent is sucked out separately, the chemical will not pass through the pump, you could use a variety of chemicals without damaging the pump.Downstream Injector has 3/8 inch quick connect. Fits most electric and gas power washer. It's connected between the pressure washer pump and the pressure washer hose.