Abundant Quantity: 4 pieces of 1/4 inch NPT pressure relief valves with seal thread lock, enough for daily use and replacement, providing convenience for your daily life. The working pressure of the safety valve air compressor is 165PSI, the flow rate is 178 CFM, and the temperature range is -50°F to +220°F. Reliable Quality: Made of brass, each air compressor release valve is corrosion-resistant, high-temperature ductile, and has low magnetic permeability, suitable for discharging air, water, and oil from the air compressor. The 1/4 inch brass safety release valve can be used in high-temperature applications up to 250 degrees Fahrenheit. Please be careful when using it. Convenient and Functional: The brass pressure relief valve can reduce overpressure or vacuum in the system. When the pressure in the air compressor box (not included) exceeds the preset level, the valve opens, and fluid or gas flows out to reduce the pressure. When the pressure drops below the preset level, the valve opens, and fluid or gas is released into the system, closing when the valve reaches the reset pressure. 4-piece 1/4 inch Male NPT Air Compressor Pressure Relief Valve Brass Safety Valve Air Compressor Check Valve (165 psi set pressure) * Although it is "Brand New", it has been opened, so it is listed as "Like New". * Operation has not been confirmed. 2125(