shower mixing valve, metal or not?
A question came up by email from a student in one of my inspection classes. I am an electrician and electrical inspector as well as an electrical instructor and have little or no knowledge of the plumbing codes so any help would be greatly appreciated.
Is there a code or federal law that mandates that the mixing valve on a shower be made from some sort of metal?
Yes this question will relate back to the electrical code and the student asking the question will be a multi-trade inspector when he finishes all his community college classes.
And yes I have searched the NC plumbing code to no avail.