I really wonder what "physical damage" that would be stopped by sch 80 and not sch 40.
When is the threat of damage "severe"?
This physical damage thing is so subjective that I think it is more opinion than fact.
It is interesting that if you insist on sch 80 fittings the installer is probably going to a plumbing store. If you see male adapters and couplings a little darker than RNC, they probably came from Fergusons, not Graybar.
