General Pump YU21405 Trapped Pressure Unloader Valve 21 GPM 4050 PSI (I3) by | Jul 24, 2026The General Pump YU21405 pressure unloading device is made with highly durable brass and stainless steel. This unloader has 1/2″ inlets, 1/2″ bypass ports, and a 1/2″ outlet. Max GPM: 21. 21 GPM max flow rate.
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