The "relief" hole is bunk. not needed.

--
Steve Barker




"Ermalina" wrote in message
...
Be sure you have a small hole drilled in the sump discharge pipe to
prevent air lock.

http://store.waterpumpsupply.com/supuinpr.html

"Drill a relief hole (1/8" or 3/16" diameter) in the discharge pipe.
This hole should be located below the floor line between the pump
discharge and the check valve. Unless such a relief hole is provided a
bottom intake pump could "air lock" and will not pump water even though
it will run."