air valve, air poppet valves: 1.Mat:INOX 4034 Hardness:38-42HRC, 2.Pressure: 1.5-6BARS. Air valve, air poppet valves: CUMSA air poppet valve,high precision,easy install, save space, also can exert very good function,plastic mould part. 1. Its use in vacuumed condition in the deep and closed molds, or it can be used for having problems with ejection of ejector pins and for the larger size of final ...