check valve for Co2 Tank?

[georgeortiz]

Hi,
Does anyone know about the azoo Co2 check valves? If not can you tell me which one if any are recommended? I thought the bubble counter would act as a check valve but, after being hesitant in getting the setup going I wanted to check on putting a Co2 check valve in place.

[DrMark]

The azoo check valve will work fine. The azoo is also ozone ok. Any air tubing check valve would be fine for the CO2.