Originally Posted by PNW_Steve
No, we were talking about a threaded adapter to adapt from Butress thread to NPT.
I never did find them at Lowes but I did find that US Plastics has them for a bit over $7.
Google Hayward flow controls HDPE tank fittings they have most of what you are looking for including swivel threaded fittings.
Spin on fittings work good if they work for your application.
I have drilled and tapped 12-6" PVC pipe for smaller condensate drains and plastic drums for rain barrels including barrels 7-8' above the ground with 4" male adapters for the gutter in,2" males to connect multiple barrels and 3/4 boiler drains sorry water spigots for hose connections.
Drill the opening correctly and screw the fitting in.
I salvaged tanks from a 35' coachmen and made them work.