Thermal Relief Valve: Model Number: 7101359 Dimension: OD of 1/2''. Length of 1.7'' Material: Metal (Brass) Compatibility: Pressure washers of 1/4'' NPT This thermal relief valve is work to prevent thermal damage to water seals and other internal components by releasing hot water from the pump, and allowing cold water to enter through the pump inlet. Easy to replace and can quickly get into work to solve your problem. Note: It should be operated at a safe temperature. The thermal relief valve must be replaced if the pump have ever overheated. Welcome to contact us if you have any questions! Thermal relief valve numbered 7101359, high quality replacement part for pressure washer pumps, quickly gets you back to power washing projects. Fits 1/4" NPT. Outer diameter of male thread is 1/2''. Length of 1.7''. Work to prevent thermal damage to water seals and other internal components by releasing hot water from the pump, and allowing cold water to enter through the pump inlet. Make of hardness and durable metal,well-tested by manufacturer, ensures long service time. Compatible with most pressure washers have 1/4'' NPT.Max inlet pressure of pumps is 200 PSI.