Material of parts of this air compressorMade of metal pressure gauge. This is a canonical component. Please use glue to install the product on the Maximum current16-20A. Pressure range: 90-120 psi. Male Thread Diameter: Approx. 21mm (1/2 "NPT). Valves male thread diameter: 13 mm (1/4 "NPT). 1-1 / 2 "Diameter Gauges: 0-180 PSI. With 2 connectorsBlack on / off button. Automatic control, automatic loading / unloading. Connection of the air tank 1/2 wires 21 mm in diameter, requires its own assembly. NoteIf the pressure is below 90 psi, turn on the compressor. If the pressure is greater than 120 psi, turn off the compressor. Compressor switch control can automatically control the air compressor pressure. Power SavingStandard Air Compressor Pressure Switch Control Valves designed for saving electric energy of the air compressor. Size Chart: 13.5cm/5.31inch Package Includes: 1 Pressure Valves Switch Assembly Note: Please allow slightly errors due to manual measurement and different monitors. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.