Originally Posted by soapy_junk
that makes sense.. i didn't think of it that way.. if they say the OD is 1.9.. im guessing a 2" hole saw?... and i planned on having a support on the virticle pipe exension so that should help too..
also.. are people using the 'close' nipple where it is really short and fully threded.. or are like a 3" nipple where the middle has no thread
Use the shortest nipple you can find. You may have to use a spacer of some kind to take up some slack if unable to tighten the nut all the way in.
A 2" hole should work but I'm not so sure about drilling a hole that large through a thin curved surface. The bit may start wandering and you may end up with a not so clean, bigger hole which you don't want.