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- Aug 5, 2016
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Hi. I have this Modular Marine 1200gph Overflow and I didn’t ask to make the drain holes about 35mm for 3/4” BulkHeads (big mistake on my part). It fits Uniseals (I don’t want Uniseals because I heard it is just unreliable for flat surfaces. So far I tried to sand paper the hole to my desired size and it. Takes. Forever. How do I enlarge the hole safely and quicker than what I was doing?