Since I didn't have a drill bit big enough to enlarge the hole I ran a chucking reamer around the hole to make it big enough and then a large drill bit to round it out a bit (it was raggedy from the reamer). It doesn't need to be perfect as there will be washers on both sides and gobs of sealant. NOTE: If you have to do this, best to do it before it's installed in the tank as it creates lots of metal shavings... The right one was already installed, so I had to vacuum that out (and still need to go over it with a wet rag to get the remainder). The left one isn't installed yet, so I did that now.
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