Greetings and welcome aboard the CF, bulldog.
Polybutylene pipe, or Poly-B, is a grey plastic pipe
that was manufactured from the late ‘70s until the late ‘90s, at which time it was discontinued.
One of the problems with Poly-B plumbing
is that the pipe may look fine from the outside, but it’s slowly deteriorating from the inside, and could rupture at any moment.
Poly-B doesn’t handle UV (sunlight) hot water
, or chemicals (ie: chlorine) very well, and the fittings were sometimes made of plastic which cracked and leaked over time. There are many reports that Poly-B piping began to leak around 10 to 15 years after installation
to Poly-B piping is very difficult since neither PB plumbing pipe, nor the Quest fittings used to connect it, are commonly made or sold anymore. The standard solution to problems, then, is to make repairs
to the damaged sections of PB is by transitioning to another type of pipe (ie: PEX), or even to re-pipe the entire system.