Features:    *Air Compressor Pump Pressure Control Switch 4 Port 220V/380V Manifold Relief Regulator 90-120PSI Control Valve with Gauge  *Small size and light weight  *Piston seal adopts V-ring, which has good sealing effect, wear resistance and stability.  *Piston type structure and flow rate are 30% larger than traditional diaphragm type.  *The valve body structure has overflow, and the decompression speed is fast and intuitive.  *High accuracy of voltage regulation and sensitive response  *The structure can install the original gas pressure gauge, the original gas vent valve, and the application is various.  *Easy installation. Reverse, vertical and horizontal installation can be made according to customers'preferences. The appearance is atmospheric and beautiful.  *This square pneumatic pressure regulating valve is widely used in direct-line, oil-free silencer and small belt conveyor.  * There is a red ON/OFF switch knob，convenient design for use.  *Auto control, Auto load/unload. Pressure lower than 90PSI, turn on the compressor. Pressure over 120PSI, turn off the compressor.  *Air Compressor Pump Pressure Control Switch 4 Port 220V/380V Manifold Relief Regulator 90-120PSI Control Valve with Gauge    Specifications:  Colour: As shown  Material: Plastic, Electroplating Aluminium, Iron  Voltage: 220V/380V （Optional）  Operating pressure range: 0-0.8Mpa  Maximum flow: 3000L/min  Gauges: 0-180 Psi  Relief Regulator adjust Pressure Range: 90-120PSI  Inlet and Outlet Port Inner Thread: G1/4 0.4＂/11mm    Package Contents:  1 x Air Compressor Pressure Valve Switch