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Modern plastic plumbing products are usually designated with either "NSF-PW" or "NSF-61" to indicate that the product complies with the health effects requirements of NSF/ANSI Standard 61 for materials designed for contact with water. Modern plastic plumbing products are usually designated with either "NSF-PW" or "NSF-61" to indicate that the product complies with the health effects requirements of NSF/ANSI Standard 61 for materials designed for contact with water. CPVC piping has a very high expansion / contraction coefficient. This piping grows significantly when hot water flows through it. The growth can be nearly 5 inches for every 100 feet of piping if the temperature of the water rises 100 F. Water temperature in regular household piping rarely rises 100 F, but even if the temperature goes up just 50 F, the pipes can expand causing all sorts of noise. If you decide to use CPVC, make sure the pipes are not tightly clamped and they pass through large enough holes in wood framing members so they do not bind.