Originally Posted by GEORGIA CRACKER(FROM TEX)
You need a 1" hole for the 3/4 pipe nipples. I used a hole saw for mine and the nipples fit tight. I backed them up with conduit nuts one inside, one outside.
I used 1" pipe nipples on mine, which needed a 1 3/8" hole with the conduit nuts on front and back.
I couldn't find the hole size for 1" nipples on here so just wanted to make available to the group (went through a couple of $12 bits prior to finding the right size lol).