Originally Posted by mpolli

I have a Zoeller M53

http://www.zoeller.com/zcopump/products/sumpeff/50series.htm

It was in the house when I bought it. The output pipe screws into a 1.5" NPT thread at the base of the pump which I think is pretty standard for these. I am replacing the output pipe because whoever installed it glued the pipe into the threaded fitting crooked, and unfortunately it was leaning toward the float, and the float would collect a little soap scum and then stick against the pipe and not work.

Anyway, I removed the old output pipe (1.5" ABS) and I noticed that they had drilled a 1/8" hole about 8" from the base (8" up from where it connects to the pump). Is this standard practice? I cannot find any installation instructions on the Zoeller site.

Thanks