The item is a professional and practical air compressor pressure control valve, which is an for miniative air compressor, and for replacing a faulty or poorly functioning air compressor pressure. It can help you to save electric energy of the air compressor, and has a red ON/OFF for easy to use. Features - Color: mainly black. - Material: durable hard plastic and metal. - Maximum voltage: . - Maximum Pressure: 175 PSI. - Port Diameter : 13mm/0.51 inch(Thread); Bronze Tone Connector : 7mm/0.49inch ( ); - Black Connector Inner Dia. : 20mm/0.28 inch; Button Diameter : 2cm/ 0.8 inch. - Total Size : 12.7 x 8.2 x 5.1cm/5 x 3.23 inch(L*W*T). - and Air Compressor Pressure Control Valve. - An excellent for miniative air compressor. - It can help you to save electric energy of the air compressor. - Auto control, /unload. - Easy to install and convenient to use. - Come with a red ON/OFF for operation. Package list: 1 * 20A 175PSI 12 Bar 4 Port Air Compressor Pressure Control