I use a 3" hole saw for 3" pvc fittings. If it doesn't fit snuggly enough to stay in place, put a couple of wraps of duct tape (I used red) on the outside edge of the fitting and push it into place.Yes please do elaborate. I used a jig saw or some such the first time I did this and it was a royal pain. You need a proper drill bit but the first one I got gummed up. Frustrated! Help a gal out!
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