Pressure Relief Valve 180/280/380/480/3900/ 9-100-9002 OEM Made in California, This is a pressure regulator to keep too much water flow from going to booster pump sweep.  It is critical to realizeif you have a lot of bypass you should use a pressure restrictor that comes in the wall fitting kit in the quick disconnect.

Pressure relief valve 180/280/380/480/3900 9-100-9002 OEM

SKU: 16402