ZK1 Unloader by General Pump Flow Sensitive Unloader 2-10 GPM 3600psi max. SPECIFICATIONSGPM2.3 to 10.8Max PSI3600Inlet3/8" BSP-FOutlet1/2" BSP-MBypass1/2" BSP-MTemperature165° FShip Weight2.3 lbs.General Pump ZK1 Flow Sensitive Unloader 2-10GPM 3600PSI Max