PRODUCT FEATURES Giant Pressure safety relief valve. These valves have 3/8" mpt threads. Please choose pressure range. Reviews Featured Products General Pump Safety Relief Valve $25.35 Choose Options General Pump Thermal Relief Valve $16.35 Choose Options Pressure Pro 12 Volt Hot Box Heats Up To 8 GPM Pressure Pro $3,844.71 Add to Cart Pressure Pro 12 Volt Hot Box Heats Up To 6 GPM $3,418.00 Add to Cart