I had a Liberty Sump jet water driven back up sump pump installed. The plumber used a $30.00 Watts dual check valve in the inlet water line to the sump pump.
After doing some research I am under the impression that to be code compliant a redused pressure zone backflow preventer which costs about...
I just purchased a 23 year old house and I was checking the sump pump for proper operation.
This is the first home I have had that uses a sump pit for ground water removal.
What I have found is that my sump pit is about 36" deep with a 4" PVC pipe coming into the pit about one half to two...
