oooooo wait ha ha, my bad I was thinking of an "in-line" check valve not the air check valve... since you have the 3 tanks in one sump I thought you might if had in-line check valves on the over flow so they didnt back fill into the sump during a power outage....mike dunagan;1951609; said:They are suppose to drain back when the power is out. I am sure it will be fine. The trouble is losing the siphon and the pump overflowing all the tanks!
ya I attached mine with the PVC cement and they are solid...