[MASSTONV]

Whatever state you are in the Uniform Plumbing Code (UPC) probably applies. You may be able to find the answer in there. I am in NV so I don’t know NJ Code.

[Alberta's Child]

Thanks. New Jersey is one of several states that uses the National Standard Plumbing Code (NSPC) instead of the UPC (though they are probably very similar).

What I'm really looking for here is an understanding of NSPC provisions that were in force ten years ago.

I've gotten a Freep-mail from someone who might be able to help me on this, so I'll see what happens!