Mark P Posted March 31, 2021 Report Share Posted March 31, 2021 Home built in 1970. I found grey PVC under a toilet and running up to the roof vent. The only markings I see are "Carlon" "Vylon" "PVC". Now I know grey pipe is electrical conduit; however, was there ever a time we Carlon made DWV pipe? I've searched the internet and cannot find much. Any information is appreciated. Quote Link to comment Share on other sites More sharing options...
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