The Powermate 031-0035 Check Valve Sub may be the key component of several pressure washer systems. This compact device prevents water backflow and provides for the efficient and safe operation of the pressure washer. It's a check valve with the valve body containing a spring-loaded flapper. In the forward direction, when the water passes through the valve, the flapper opens and lets the water through. But when the water pressure drops or reverses, the flapper springs close to prevent the backflow of water. It stops the pump from working against itself which can reduce your pump’s performance and cause damage.
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