Looking for a part that will convert from 3/4" female NPT to the male threads of a 2 Liter pop bottle?
Answer:
Form a fixture to hold the two bottles in position and any plumbing you wish.
Coat (2) bottle nipples with paraffin, then pour a block of epoxy in a form. Drill galleries & fastener ports in cured block as required.
Done.
errr ... great idea. You do know the Darwin Award is posthumous right?
Take the 2 liter cap, and cut the top off. Glue this to a 3/4 npt to pvc adapter with epoxy. The cap should fit in the female (pvc) end, and you can get the adapter in either male or female npt.
You can probably find plastic tubing that has an inside diameter that will fit over the bottle neck. If you need to put a hose clamp on it, find a rigid plastic pipe that will fit into the bottle neck to keep it from collapsing. It should be easy to find something to go from the plastic tubing to the 3/4" NPT. If that arrangement won't withstand the gas pressure, the bottle probably won't either.
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