About This Package Includes: 2 pieces 1/4 inch NPT threaded pressure relief valve with seal thread locks, for your daily use and replacement Durable: The air compressor check valve made of brass, With strong oxidation resistance, not easy to rust, corrosion resistance.The thread is treated with high-quality glue, and the sealing is good. Product Information: Relief pressure preset to 175 psi with flow rate of 67 scfm, the temperature range is from 32 degrees Fahrenheit to 176 degrees Fahrenheit Warm Tips: 176 F maximum temperature for use in high temperature applications, please pay attention to safety when using. Practical Function: the air compressor pressure valve can reduce overpressure in the system; When the pressure in the air compressor box exceeds a preset level, the valve opens, allowing fluid or gas to escape to reduce the pressure; When the pressure drops to the specified value, the valve will automatically close to ensure the safe operation of the equipment Overview Material : Brass Brand : LSTOPGO Item dimensions L x W x H : 0.51 x 0.51 x 1.3 inches Exterior Finish : Brass Inlet Connection Type : NPTF Outlet Connection Type : MNPT Maximum Operating Pressure : 175 Pound per Square Inch Number of Ports : 2 Manufacturer : LSTOPGO UPC : 795847718934