Structure: The air compressor pressure relief valve is equipped with a 1/4" outlet safety valve and 2 pressure gauges. It is equipped with an on/off switch. The piston seal is V-shaped with good sealing, wear resistance and stability. Advantages: Piston structure, 30% higher flow rate than traditional diaphragm type Function: The valve body structure is equipped with an overflow port, which can quickly reduce pressure: The air compressor pressure relief valve has high opening and closing accuracy and fast response. The air compressor pressure relief valve has a small volume, light weight and convenient installation. Compressor control valve quick pressure relief valve with pressure gauge the main function of this valve is to adjust the stop and start pressure of the air compressor. Features: Helps you save the electric energy of the air compressor. High voltage regulation accuracy and responsiveness. With on/off lever. Users can make adjustments according to their actual situation.Easy to install and use.Specifications:Material: metal + plastic.Connector size: G2 - 1 / 4inPressure gauge size: G1 / 8inPressure range: 0.051.2mpaMaximum flow: 3000l / minMaximum voltage: 240V.Maximum current: 20A.Pressure switch control range: 90 - 120 PSIContents: 1 x air compressor switch pressure,"