Comprehensive Package: Each purchase includes 2 thermal relief valves with a 1/4 inch NPT thread size. Designed to activate automatically at 145°F, these valves help maintain safe operating conditions by regulating internal temperatures up to 200 PSI. Engineered for Durability: Made from high-quality brass, these thermal relief valves offer excellent resistance to oil and corrosion, ensuring long-lasting and reliable performance in demanding environments. A key component for preserving pressure washer efficiency. Protective Mechanism: These valves play a critical role in preventing overheating. The built-in seal melts at 145°F, releasing hot water and allowing cooler water to enter, which protects the pump and extends its service life. Universal Fit: Compatible with various pressure washer models, including but not limited to brands such as Simpson, AR Blue Clean, and others. Direct replacement for part numbers 678169004, 678169002, 678169001, and 208673, offering broad model compatibility. Ease of Installation: Designed for simple installation without the need for specialized tools or professional assistance. The 1/4 inch NPT threaded connection allows for quick and secure attachment, making maintenance convenient. Color: Gold Material: Brass Package Contents: 2 x Thermal Relief Valve Note: Light reflection and differences in display settings may cause slight variations between the color shown in the image and the actual product. Measurement may vary by +/- 1-3 cm.