If you have this grey water line in your house you most likely have Poly B Plumbing installed. Poly B was used as water line material from the late 1970s to late 1990s. Polybutylene (PB) Plumbing is used for hot & cold supply piping in homes, also known as "Poly-B." It was less expensive in material cost and easier to install than traditional copper plumbing, however PB has attracted considerable attention over the years over concerns surrounding PB's potential to leak with a number of homeowners who have encountered minor to severe leaks. The claim is that polybutylene pipes and fittings may deteriorate, corrode and fail when exposed to hot water over 82°C (180°F) and high chlorine residuals in water. If you have Poly B plumbing in your current house or one you are potentially buying it is good to consider the pros and cons prior to its removal. Many homes have had no issues over the years where some have had costly leaks that sometimes go unrepaired for weeks or even months. It is best to contact a licensed home inspector to determine whether or not it is a good idea to replace the piping with more modern options.
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