I can’t find pvc piping mentioned in particular in the manual. I seem to remember it being okay in the past, but I am not sure. Is pvc piping legal material?
I would believe so that PVC pipe would be considered a raw material, and be used in any dimension. This is as long as you don’t buy it in the final form that it is being used. I think fittings are except from this rule as well.
Based on the FTC official forum, PVC is considered raw material.
Based on the response in the official FTC Forum at the link above, PVC is considered raw material.