How to Find a Reliable HVAC Contractor for Your Home
Wednesday, 31 March 2021
Carlon Vylon PVC
Some carbon is added for additional UV resistance. Much of the gray PVC I've seen used as DWV is schedule 80. You can drive a truck over it.
source
https://www.inspectorsjournal.com/topic/18869-carlon-vylon-pvc/?do=findComment&comment=172543
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