Jerry Mc., Rick,

I think that's CPVC, see that slightly darker gold stripe down the pipe - it's Flowguard Gold.

CPVC is allowed for T&P discharge and drain lines.

Of course, though, it should not be within 6" of the draft hood.

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Jerry Peck, Construction / Litigation Consultant
Construction Litigation Consultants, LLC ( www.ConstructionLitigationConsultants.com )