Bill and Elaine
New member
If you drill the hole a little too small ...you will never get the uniseal in.....make it the right size and then silicone around it.......you know they hardly ever leak.....I would only worry about it if the skimmer was going to be out side the sump.....and take it from a guy that just switched from an external skimmer to a G3 in the sump....ITS ALOT SAFER