Polybutylene pipe is a discontinued pipe.
The price of a polybutylene pipe will depend on how big it is, if it has any alloys in it, and how long it is. Without this information, it is near impossible to give a quote on price.
I would say a form of pex plumbing
i would think that you could acquire a polybutylene pipe at sears, home depot, wal mart, or just any home appliance store. You will just have to look around maybe make a few calls
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.
They grey pipe you are referring too is polybutylene, it was the subject of one of the largest class action lawsuits in plumbing history and is no longer used. Transition to a different pipe depends on the method used for installation. This job may involve a considerable amount of repiping I recommend calling a licensed plumber. Check the polybutylene class action settlement to see if you qualify. The dates for most of the settlement relief is already past.
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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.
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.
C.G.F Clarke has written: 'Polybutylene'
Pipe is made of a wide variety of materials - like galvanized steel, black steel, copper, cast iron, concrete, and various plastics such as ABS, PVC, CPVC, polyethylene, polybutylene and more.Pipes are identified by "nominal" or "trade" names that are loosely related to the actual dimensions. For instance, a 2-inch galvanized steel pipe has an inside diameter of about 2 1/8 inches and an outside diameter of about 2 5/8 inches.In Plumbing pipe size is referred to as nominal pipe size - NPS, or "Nominal Pipe Size". The metric equivalent is called DN or "diametre nominel". The metric designations conform to International Standards Organization (ISO) usage and apply to all plumbing, natural gas, heating oil, and miscellaneous piping used in buildings. The use of NPS does not conform to American Standard pipe designations where the term NPS means "National Pipe Thread Straight".