Household plumbing systems use PEX for pipes to supply water and carry away sewage. The term PEX stands for "crosslinked polyethylene." PEX piping is manufactured by melting high-density polyethylene ...
If you’ve never heard of polybutylene piping, chances are you’ve never needed a major plumbing renovation in your house. Polybutylene is often called “poly,” “Poly B,” or “PB.” These days, it no ...