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I have seen some information on this topic, but can’t find specifics. I am hard plumbing my pool before opening this season, and decided to add a second return. I measured the return and it appears to be 2 3/8. What size hole do I drill into the steel wall? I have seen 3 inches and 2 1/2...

What size hole are you drilling for your return? I have seen 3 inch hole, 2 .5 and 2 3/8!? Confused as I am doing doing it this weekend as well.