Polybutylene pipe is a discontinued pipe.
I would say a form of pex plumbing
Its not bad as long as they are not leaking. Unfortunately polybutylene pipes have the best chance to start leaking at some point and it can be costly to repair.
Polyethylene and polybutylene are two common types of flexible tubing used in plumbing, and both are used in hot and cold water supplies in place of traditional copper lines.
As I understand it polybutylene hasn't been removed from the formal plumbing code, however the sale of polybutylene was quickly phased out in or around 1995 which is when the major class action lawsuit (Cox v Shell Oil) was settled for just shy of a billion dollars. As you likely know there have been countless problems with all variations of polybutylene pipes and associated fittings, and although it's still listed in the code, consumers should not consider this an endorsement of quality or performance.
There is considerable risk of pipe or plastic fittings splitting. Poly B has long been disliked for this, and I regularly get called to replace it with PEX.
No. PEX and PB is different chemical compounds and have different working parameters. As I know usage Polybutilene for water supply system is not allowed in US. Use PEX tubing for plumbing.
PVC is commonly used in plumbing
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Plumbing Supplies do not go bad, they last a long time with the proper care and cleaning.
There are many kinds of bad plumbing problems with all their different ways of fixing. You have to be more specific.