CO2 is a special gas which has quite different physical properties to air. DENNERLE has developed a Dennerle CO2-special check valve for operation with CO2. The core element is a special permanently elastic, CO2-proof membrane. It is fitted under tension, in firm contact with sealing rims.
2 hose connectors with screw fittings ensure CO2-proof connection.
It broke down in less than a month (blocked passage).
I feel I wasted my money