Gas Mask Water Supply Air Valve/Plug

Replacement for water supply that acts as rotary air valve. In case you need a secondary (redundant) air supply. Does not contain any one-way valve, just rotary limiter for air amount. I've included 2 variants of the column (the one red on my photo), with different air throughput. Please stay safe. Tested on third-party (cheap / fake) Israel Gas Mask, you may need to scale it to fit yours.