I need to make some connections thru the wall of the IBC that I'm gonna use for a fish tank. Since both are at the water line or below I need to figure out something water proof. These are for the overflow lines to feed the grow beds and to maintain the fish tank level. I would like something that is 1.5" or 2" pvc. Has anyone had experience doing this? The hardware stores that I shop at really don't have anything that will work.