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.
source https://www.inspectorsjournal.com/topic/18869-carlon-vylon-pvc/?do=findComment&comment=172541
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