Barrel Buttress 2 inch Hole

thingiverse

I need 2 inch holes in barrels for growing hydroponic cucumbers in rock wool and net cups. Since I may want to use the barrels later for other uses, I didn't want to drill 2 inch holes in the barrel so I made this adaptor to create a 2 inch hole in place of the 63mm buttress threaded bung. The other plug is a standard pipe thread so I'll simply purchase a short 2" pipe nipple. Since I don't need a gasket, I flipped HammerDan's part over and cut the flange down to a minimum so that I didn't need supports. A small overhang remains under what's left of the flange which causes a few loose strands but they are easier to deal with than any support alternate. I really should slope the flange but it works for what I needed.