When I built mine I used the 1" nipples without nuts inside.
The threads are nice and tight with a 7/8" hole.
I'm happy with the way it worked out.
Originally Posted by jcinadr
I noticed once upon a time pipe bushing were recommended, but I think the idea was ultimately dropped for some reason.
I am curious about the reason as I was planning on using the bushing threaded from the inside (so that the flange would be the inside "nut"), and the 3/4 valve would thread on from the outside.