Polybutylene piping was used in over 10,000,000 homes through out the US from 1975-1990. It was believed a better, and more cost effective way for builders to plumb homes. The piping was flexible and didn’t require the additional work of bending and fastening that copper demanded.
Issue began to arise with a few brands after 10-15 years of instillation. Specifically “PB-1” had problems with their crimp connections. The connections would eventually fail at the manifold or at the fixture and cause water damage. As a result a class action law suit was filed and several of the homeowners where able to receive funds to remove and replace the plumbing. Sadly the suit has long since been paid out.
PB piping can come in several colors but the most common in Las Vegas is grey with a red or blue strip. The piping is 1/2 inch in diameter and traditionally is marked on the side with “PB2110”. You can visually see the piping coming from the walls and connected to fixtures, as well as in their closet like manifolds.
If a home has PB piping it is always best to inquire with the seller in regards to past plumbing/issues leaks and make sure that your insurance company will not be charging additional fees due to the piping. Unfortunately there is no easy or inexpensive way to replace the piping.