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Anyone use pvc with a threaded cap for diy co2. I was thinking of building something where I didnt have to use the two liter bottle. Its kind of a pain in the rear with the small neck of the bottle.
 

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Use a funnel and save the money for fish or plants.

If you're going the PCV route, put a toilet closet flange on the bottom for stability and an internal plug for the bottom. I recommend not clamping your tubing in place, just in case something goes wrong and pressure needs to escape.
 
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