How well do they work? I replaced an old cast iron one with a pvc one a little over a year ago. This house lot is lower than others surrounding it. When it rains real hard their sewer tends to back up and they are not even on a private sewer system.(no septic tank) The last hard rain we got the sewer backed up into the house. Why would the backwater valve not prevent this? I checked it out today, only to find a little grease behind the flap. Cleand it up put the cap back on and hope it is ok.
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