Do I Have Polybutylene Pipes?
If your water supply pipes are gray, flexible, and stamped “PB2110”, you have polybutylene. It was installed in homes built between roughly 1978 and the mid-1990s, and it fails from the inside out. Here is how to check in about five minutes.
The 30-second check
Go to your water heater and look at the pipes running into it. You are looking for three things at once:
- Gray — occasionally blue or black, with a dull matte finish
- Flexible — it bends by hand and is not rigid like copper or CPVC
- Stamped “PB2110” — printed along the length of the pipe
All three together means polybutylene. The PB2110 stamp alone is conclusive.
Where to look in your home
You need exposed pipe. These are the six places it is usually visible without opening a wall:
At the water heater
The supply lines running in and out. Usually the easiest place to see bare pipe.
Under bathroom and kitchen sinks
Look at the supply risers behind the shutoff valves.
At the main shutoff valve
Often in the garage, a utility closet, or near the water meter.
Where pipes enter through a wall
Garages and laundry rooms frequently have unfinished penetrations.
In the attic or crawlspace
Runs are often exposed here — bring a flashlight.
Near the water meter, outdoors
Blue polybutylene was commonly used for underground service lines.
Check more than one spot. Partial repipes are common in South Florida. Copper under a sink does not mean the whole house is clear — original polybutylene may still run inside walls and ceilings.
Found gray pipe and not sure?
Send us a photo or call and describe what you are seeing. We will tell you whether it is polybutylene — no visit required to answer that question. Polybutylene repipe estimates are free.
Polybutylene vs. PEX vs. CPVC
These three get mistaken for each other constantly. The printing on the pipe settles it every time.
| Polybutylene | PEX | CPVC | |
|---|---|---|---|
| Color | Gray, blue, or black | Red, blue, or white | Cream or tan |
| Flexible? | Yes | Yes | No — rigid |
| Printed code | PB2110 | PEX + standard | CPVC + CTS |
| Fittings | Crimped, gray plastic or copper | Crimped or expansion | Glued |
| Still installed today? | No — discontinued | Yes | Yes |
Why this matters more in South Florida
Polybutylene was installed heavily across Palm Beach, Broward, and Martin County during the building boom that ran from the late 1970s through the mid-1990s. A large share of the region’s housing stock dates from exactly that window.
The insurance problem
Many Florida insurers decline to write new policies on homes with polybutylene supply lines, and some will not renew existing coverage. Carriers differ, so confirm your own position with your agent — but in a hard insurance market this is frequently the reason a homeowner discovers the pipe at all.
How it fails
Oxidants in treated municipal water degrade the pipe’s interior wall over years. Because the damage is on the inside, there is usually no warning stain or drip — the pipe holds until it does not. Fittings typically go first.
The Cox v. Shell settlement that once reimbursed replacement closed to new claims in 2009. Replacement today is a homeowner cost, though a documented repipe often improves both insurability and resale.
Common questions
What does polybutylene pipe look like?
Polybutylene is usually gray, though blue and black were also manufactured. It has a dull matte finish, bends easily by hand, and is typically 1/2 inch, 3/4 inch, or 1 inch in diameter. The clearest identifier is the code PB2110 printed along the pipe.
What years was polybutylene used in homes?
Polybutylene was widely installed in US residential plumbing from roughly 1978 until the mid-1990s. If your South Florida home was built or repiped in that window, it is worth checking. Homes built after about 1996 are very unlikely to contain it.
How is polybutylene different from PEX?
Both are flexible plastic, which is why they get confused. PEX is usually red, blue, or white and is printed with the word PEX along with a standards code. Polybutylene is usually gray and printed PB2110. If the pipe says PEX, it is not polybutylene.
How is polybutylene different from CPVC?
CPVC is rigid and will not bend by hand. It is typically cream, tan, or off-white and joined with glued fittings. Polybutylene is flexible and joined with crimped fittings. If the pipe flexes, it is not CPVC.
Why is polybutylene a problem?
Oxidants in treated municipal water gradually degrade the interior wall of the pipe. The damage accumulates out of sight and the pipe can fail suddenly rather than developing a slow visible leak. Failures often happen at fittings first.
Will polybutylene affect my Florida home insurance?
It commonly does. Many Florida insurers decline to write new policies on homes with polybutylene supply lines, and some will not renew existing ones. Requirements vary by carrier, so confirm your specific situation with your insurance agent.
Is there still a class action settlement to pay for replacement?
No. The Cox v. Shell settlement that once funded polybutylene replacement closed to new claims in 2009. Replacement today is paid by the homeowner, though some insurers offer premium reductions after a documented repipe.
Can polybutylene be repaired instead of replaced?
Individual failures can be patched, but the underlying degradation affects the entire system, so repairs tend to be followed by further failures elsewhere. Full repiping is the standard remedy and is what most insurers want to see documented.
If you found polybutylene
Get a straight answer about your pipes
Licensed technicians (FL #CFC1434273) serving Palm Beach, Broward, and Martin County. We will confirm what you have and what it would take to replace it — repipe estimates are free.