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== PVC, CPVC, and PEX ==== PVC and CPVC Plastic ==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.CPVC plastic 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.=== Polybutylene ====== PVC ===This pipe is gray and very pliable, but unlike CPVC, "polybute" is very rugged. In freezing temperatures it will expand to reduce the risk of splitting. In the first days of polybute there were faulty fittings. It is easy to snake polybute pipe through walls without the need for concealing joints.Regular PVC plastic pipe is typically restricted for cold water use only. PVC should never be used for hot water. In some areas plumbing code requires that the same pipe type be used for hot and cold so in that case PVC could not be used at all.=== PVC ===== Polybutylene Plastic == This type of plastic pipe is gray and very pliable, but unlike CPVC, "polybute" is very rugged. In freezing temperatures it will expand to reduce the risk of splitting. In the first days of polybute there were faulty fittings. It is easy to snake polybute pipe through walls without the need for concealing joints. === PEX ===Regular PVC pipe is typically restricted for cold water use only. PVC should never be used for hot water. In some areas plumbing code requires that the same pipe type be used for hot and cold so in that case PVC could not be used at all.Cross-linked polyethylene, commonly abbreviated PEX or XLPE, is a form of polyethylene with cross-links. PEX pipe is suitable for use with hot or cold water. With the proper adapters, PEX pipe can be used with steel, copper, PVC and CPVC plumbing pipe. PEX is the most flexible plumbing pipe available. It can be bent around most corners without a coupling or fitting. For example, 3/8" pipe may be bent to a 4" radius and 1/2" pipe to a 5" radius. PEX flexibility also allows it to expand and contract more than other types of pipe.