3/8″ MPT Thermal Relief Valve – 145°F – General Pump Compact – SKU: 100557

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:

• Thread Size: 3/8″ MPT (Male Pipe Thread)

• Temperature Rating: Opens at 145°F

• Type: Thermal relief valve – automatic reset

• Design: Compact profile for tight installs

• Brand: General Pump

• Application: Protects pump from overheating during bypass or idle modes

• Compatible with softwash and pressure washer systems

Specifications:

• SKU: 100557

• Material: Brass body with stainless internals

• Max Pressure: Up to 4,000 PSI (system dependent)

• Temperature Activation: 145°F (±5°F)

• Connection Type: 3/8″ MPT

• Function: Opens to release heated water, resets when cooled