Ultimate Washer UW11-PW6022 1/2 inch Male NPT Pump Thermal Relief Valve up to 8 GPM Pressure Power Washer Pump keeps pressure washer pumps operating in a safe range to prevent overheating.
When water temperatures reach above 145 degree F, pump seals may fail.
The thermal relief valve opens to release hot water and allow cold water to enter the pump so it continues to operate at a safe temperature. Should the pump ever overheat, the thermal relief valves must be replaced.

• 1/2" MNPT Thermal Relief Valve
• Universally Fits 1/2" Lines, Replacement for Karcher Models G4000OH, G4000RHv2, HD3.1/31Pv2, HD4.0/36Pv2
• Max Temp: 145 degree F
• Pump Saver Device

• Thermal Relief Valve is Used to Prevent a Pressure Washer Pump from Overheating if Running in Bypass for Extended Periods of Time
• Valve Opens at 140 Degree Discharging Hot Water from Pump and Allows Cool Water in; Automatically Resets at Cool Down to 115 Degree F
• 1/2" MPT (valve is mounted in bypass line); 1/8" FPT Discharge Side
• Material: Brass and Plastic (flow directing cap)
• Universally Fits 1/2" Bypass Lines

Thermal Relief Valve is Used to Prevent a Pressure Washer Pump from Overheating if Running in Bypass for Extended Periods of TimeUltimate Washer