Usage Tips:Comprehensive Package: Each purchase comes with 2 thermal relief valves, each featuring a 1/4inch NPT thread size. Designed to automatically engage at 145F, these valves your pressure washer operates safely by regulating internal temperatures up to 200 PSI.Engineered for Durability: Crafted from robust brass, our thermal relief valves offer exceptional resistance to oil and , ensuring and reliable performance under tough working conditions. A vital investment for maintaining your pressure washer's efficiency.Protective Mechanism: These valves an essential role by protecting pressure washers from overheating. The built-in seal melts at 145F, allowing hot water to exit and cool water to enter, thus safeguarding the pump and extending its lifespan.Universal Fit: Perfect for use with a of pressure washer including , , , and more. They are direct replacements for part numbers 678169004, 678169002, 678169001, and parts 208673 , enhancing compatibility across several models.Ease of Installation: Simplify your maintenance routine with our thermal relief valves that are easy to install without the need for professional help. The threaded 1/4inch NPT connection allows for quick attachment or detachment, making it a practical choice for regular maintenance.Colour:GoldMaterial:BrassPackage Contents:2 x Thermal Relief ValveOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.