OVERVIEW & BENEFITS
The 3/8″ MPT 145°F Thermal Relief Valve (GP Compact – 100557) is a critical safety component designed to protect pumps from overheating. Installed directly into the pump head or bypass line, this valve automatically opens when water temperature exceeds 145°F, releasing hot water and allowing cooler water to enter—preventing internal damage to your system.
Made by General Pump, this compact thermal relief valve features a 3/8″ male pipe thread (MPT) for easy installation and reliable performance in softwash rigs, pressure washing systems, and high-flow pump setups.
Key Features:
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Thread Size: 3/8″ MPT (Male Pipe Thread)
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Temperature Rating: Opens at 145°F
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Type: Thermal relief valve – automatic reset
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Design: Compact profile for tight installs
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Brand: General Pump
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Application: Protects pump from overheating during bypass or idle modes
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Compatible with softwash and pressure washer systems
Specifications:
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SKU: 100557
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Material: Brass body with stainless internals
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Max Pressure: Up to 4,000 PSI (system dependent)
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Temperature Activation: 145°F (±5°F)
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Connection Type: 3/8″ MPT
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Function: Opens to release heated water, resets when cooled