You've got to be kidding! Copper is still the best pipe for water supply known to man. I wonder if he really never heard of CPVC in inside a living space, it is done. And, I have no idea what he could have meant about making CPVC "work", but yes, he did you a favor. Just wondering. Did you buy 1/2" CPVC or 3/4"? I ask because the equal the inside diameter of 1/2" copper, you would need 3/4" CPVC. 1/2" CPVC is approximately the same as 3/8" copper. Yeah, I know you didn't want a debate copper vs CPVC, but that's really what this is about.