How about just draping some fiberglass batts over it, the type used
for insulating walls and ceilings.


Joe wrote:
My sump pump stick about 3 inches over my sump pit. I would like to
cover it with some heavy material so it muffles the sound and provides
somewhat of a seal. The only thing I can think of is to cut up a piece
of tarp and glue some of that egg shell foam sound proofing material
on top. It doesn't need to be pretty. Any other ideas that might be
more effective?