DIY CO2 Check valve

[VinsonMassif]

Have people bought check valves, or made one themselves?

What have you used?

Do you have a good method?

[Phantom]

I use DIY CO2 and have a stock standard air check valve on it. That was to prevent water from being sucked back down the piping (doubt it would happen anyway). I also use 2 cheap plastic bottles with nozzles with the bottoms cut off and then sealed to each other. I was looking for syringes but couldn't find them. The purpose is to make a wide area in the tube so I can catch the yeast / sugar mixture in case it ever escaped down the tube. Hasn't happened to me yet though.

I put an airstone in my canister filter intake to introduce the CO2 into the water.

[Zev]

I use a metal Co2 proof check valve, I found the normal plastic ones failed due to the Co2 making the internals brittle and not operate.

[tbunting]

if you have to problem with the water going into the tank use a smaller 600ml coke bottle and use that as a breather bottle and how that works is that the main bottle gas gose into the smaller bottle and then out of the same bottle you have that tube going in to the tank it to what you defuse into the tank with