Screw Connectors and Couplers are needed to attach the pressure washer hose to the pump, the gun, or another hose. These connectors help secure the hose to the parts of your machine as the high pressure water passes through. If you ever see water leaking from one of the connections, you probably have a damaged connector/coupler or a worn out o-ring. Find the replacement screw connector, coupler, o-ring, or screw plug you need below. We also have Quick Connects.