It can easily adjust the air compressor to control the pressure and is low power consumption.Easy to install and remove;Quality tested for maximum reliability and high performance in even the toughest environments.The main function of the valve is to adjust the air compressor to close and start the pressure; Users can adjust according to their actual situation.Right red is the safety valve. The air regulator on both sides of the copper is an exhaust valve that opens the gas when used.Dual pressure gauges can display pressure more quickly and conveniently adjust pressure Features: 1. Durable and practical. 2. Easy to install and remove 3. The main function of the valve is to adjust the air compressor to close and start the pressure. 4. Users can adjust according to their actual situation. 5. The air regulator on both sides of the copper is an exhaust valve that opens the gas when used. 6. Right red is the safety valve. Specification: Voltage: 220V AMP Rating: 20A MAX Pressure: 5-8KG（90-120 PSI) 1 x Male Thread Dia: approx 21mm--1/2"NPT(to air compressor) 2 x Valves Male Thread Dia: 13mm--1/4"NPT; 2PC x 1-1/2" Dia. Gauges: 0.5-0.8MPA (5-8BAR)(90-120PSI). Package included: 1 x Air Compressor Pressure Control Switch Tips：The screw mouth should be coated with sealant to avoid air leakage Note : 1.Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you buy. Package includes: 1 Pc x Regulating Valve