Material: Alloy, plastic. Chrome-plated metal pressure gauge. This is a specification assembly. Rated voltage: 220/380V; Exhaust pipe: 6MM External pressure relief port: 9.5MM; Maximum current: 20A Switching pressure range: 0.5-0.8MPA (5-8BAR) (90-120PSI) Contact method: normally closed; Bracket joint size: 20MM Working pressure: 5-8KG; Life: 80,000 times