... CO2 cylinder valve,gas valve,valve,cylinder valve,CO2 valve,carbon dioxide valve Shanghai General Gas ValveCGA320 CO2 cylinder valve,gas valve,valve,cylinder valve,CO2 valve,carbon dioxide valve ModelProduct namemediumservice ... -NGTCGA320Aflapper-type co2 cylinder valveoxygen,atomosphere,nitrogen154CGA32021 ± 1.51-111/2-NGTCGA320Bflapper-type co2 cylinder valveCO2154CGA32021 ± 1.53/4-14-NGT CO2 valve ...