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Anyone have a recommendation for a good one way check valve? I use one similar to the attached link in my return line from sump to tank. Needed in the event the power goes out! Lately I have been noticing that when I do kill the pump power (ie: during water changes) the valve continues to flap open/close repeatedly. Thus over time the sump will flood by the build up of water being let past every time the valve opens momentarily.
Homewerks Worldwide 1-1/2 in. PVC Sch. 40 FPT x FPT IPS In-Line Check Valve-VCKP40B7B - The Home Depot
Homewerks Worldwide 1-1/2 in. PVC Sch. 40 FPT x FPT IPS In-Line Check Valve-VCKP40B7B - The Home Depot