Uniseals are great for curved surfaces.
Mama Bear
Aquatic-ECO is an awesome store... it appears everyone already knew that. It's too bad I don't have something like it nearby (that I know of) because there's so many thing I want to try, but I can't buy it all at once, but I'll go broke by shipping if buying it in pieces
Can't wait until I get back to Florida.
Eric
I have three 55 gallon barrels connected using uniseals. The uniseals work better than a standard bulkhead on a curved surface like the side of a barrel. I get mine from bulk reef supply.