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=== CPVC ====== Polybutylene ===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.=== PVC ===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.