1. The air compressor pressure switch is a very necessary component, which is used to install or connect the air compressor or the air pipe, adjust the air pressure and switch on the energy and turn off the compressor motor. 2. The main function of this valve is to adjust the stop and start pressure of the air compressor. 3. Features: *Durable and practical *Easy to install and disassemble *With barometer, you can set and read data *With valve knob, you can adjust the air pressure as needed *Help to save energy.