rmich732 wrote:What is the difference between pipe marked "not for pressure" and the pipe which has a pressure rating on it? I'm not talking about cellcore pipe here; at my local Lowes, there is solid pipe marked "not for pressure". What makes it not for pressure, and what is the difference between it and pressure rated pipe?
Wellllll.... the pipe that says "not for pressure" is not for pressure. You really don't give a rat's ass
why it is marked "not for pressure".
BTW, the presence of "DWV" on a piece of pipe (or a fitting) means essentally nothing. It is not at all unusual to see pipe with
both DWV and PW on it.
The important thing is that it
says PW and/or has a pressure rating printed on the pipe. If that is the case then presence of "DWV" means nothing. Any pressure rated pipe can also be used for DWV. It is the converse that is not necisarily true.