Whatevers clever man lol, either option will work...ive been using uniseals since 09 with no issues for all sorts of plumbing/filter applications. I know alot of other members who use them on systems regardless of size also, so yes there not too good to be true, they work well for round surfaces and other places u may not be able to fit a traditional bulkhead. I currently have them running on 55gal barrels and a couple acrylic tanks.
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