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Low water pressure · diagnosed first
Polybutylene Supply Pipe
Fitted widely from the late seventies until 1995, then discontinued. Worth identifying if your home is from that window — but it fails differently.
Free to homeowners in Polybutylene Supply Pipe — the contractor pays us for the introduction, you never do.
The short answer
Polybutylene was fitted widely from the late 1970s until 1995 and then discontinued. It fails at fittings and by splitting rather than by narrowing, so it does not produce the slow whole-house decline galvanized steel does — which is why identifying the material comes before diagnosing the symptom.
What this site is
PressureTrace is a referral service, not a plumbing contractor. We connect homeowners with independent contractors. Contractors are required to hold whatever credential their state or municipality demands. Every state page sets out who licenses plumbers there and where to check, so you can confirm before work begins. We do not perform plumbing work, we do not set prices, and we never charge homeowners anything — the contractors in our network pay us when we route them a call.Polybutylene is a gray (sometimes white or silver) flexible plastic supply pipe, usually about half an inch or an inch across, often marked PB2110. It was installed widely in American homes from the late 1970s and stopped being used in 1995.
Why it is different from a pressure problem
This matters for diagnosis. Galvanized steel fails gradually — the bore narrows over decades and pressure declines slowly. Polybutylene does not narrow. Its failure mode is sudden: the material and its fittings become brittle and let go. So polybutylene is rarely the explanation for pressure that has been slowly fading.
If your pressure has dropped gradually in a house of this era, the more likely causes are the pressure-reducing valve or a part-closed valve.
How to identify it
- Gray, flexible, not rigid like copper or steel.
- Often stamped PB2110.
- Look at the water heater, under sinks, and where pipes enter through walls.
- Fittings may be plastic or metal with crimped rings.
What to do about it
Identification is worth doing on its own account — it affects insurance and it affects what you tell a buyer. But it is a repiping question rather than a pressure question, and whether to act depends on what is accessible and how much of the original run is left. That is a decision for someone standing in the property.
Still not sure whether it is the whole house or one fixture?That distinction decides who you need and what it costs, and it takes one conversation. We route you to a contractor who covers your ZIP code, you are never charged, and if the answer turns out to be an aerator we will say so. And it need not be pressure — this number takes any plumbing problem.
Call (866) 838-2750