... 4034 Hardness:38-42HRC, 2.Pressure: 1.5-6BARS. air valve ,mold standard component:CUMSA air poppet valve,high precision,easy install, save space ... , also can exert very good function,plastic mould part. 1. Its use ... are made from stainess steels and it will never rust; 5. Air poppet valves are one of the most innovated tools ...