2 liter units is made with 1/2" pipe
Pingman, One of my 2 liter units is made with 1/2" pipe. I just got fittings that necked up to 1" for the bottles. If you go with 3/4" pipe you can forget about using the screw cap. You may have to file down the bottle threads as well. You'll have to use a bunch of sealer to get it leak proof. Hot glue might work.
CM
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