Hmmmmmm.... I need to think about that a bit. I never thought about it before. Except for the teflon on the pipe that enters the bulkhead, for a fact I know that leaks without it.... don't ask me how I know <_<

K, you would have to make sure there was no leak in the joints or make room for the water in the overflow in the sump. My overflow holds 5 gallons. When the pump is turned off the water just sits in the overflow... if there was a low leak it would drain out.

You'd have to make sure your overflow also has no leaks (mine presently does). When I turn off the pump the water level evens out in the overflow and the display section... if there was a leak in the standpipe it would keep going and going...

*pulls out a mop*

But I realize most peeps overflow works correctly and if there was room in the sump for the extra 5 gallons I guess there wouldn't be a need. I don't have 5 gallons space though.