About this product: Structure: Air Compressor Pressure Valve with 1/4" Outlet Safety Valve with 2 Gauges. With on/off switch. The piston seal adopts V-type seal, good sealing, wear-resistant and stable. Advantage: piston structure, the flow rate is 30% higher than that of the traditional diaphragm type. Operation: The valve body structure has an overflow port, for rapid pressure reduction. Performance: Air compressor pressure valve switch provides high accuracy and fast response. Feature: The air compressor pressure valve switch is small in size, lightweight and easy to install. Product Air Compressor Control Valve Regulator with Gauges for Rapid Pressure Reduction The main function of this valve is to regulate the closing pressure and start the pressure of the valve.