Yes, I know it’s Poly-Butyl, with both copper and silver crimp rings, and there is no 18 " copper stub on the cold supply, no shutoff either. I know there is no conduit on the supply wire, but it’s in a cabinet, mobile home. My question is, is it OK to have Two TPR valves? Yes, I know there is no discharge tube on the second valve, but that is not the question.
This was a professional install BTW, hey, we can’t all be Einsteins.