Joining a PVC pipe to a pipe fitting requires special primer and cement that melts the surface of the PVC before fusing the pieces together (like welding metal) to make an airtight bond. Here's a ...

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 ...