Note to readers: This post was updated on July 26, 2026 to explain what PEX pipe actually is and how it compares to copper, and add links to our related repiping guides. We refreshed the details below so the advice reflects how we approach this work today.
PEX (cross-linked polyethylene) pipe has become one of the most common materials plumbers use for repiping homes, and for good reason. It is flexible, resists corrosion, and installs faster than rigid pipe — which usually means less demo and a lower labor bill for the homeowner. Our technicians go through Uponor PEX training every six months to stay current on installation methods and new fittings, since the materials and codes in this trade keep evolving.
What Is PEX Pipe?
PEX stands for cross-linked polyethylene. It is a flexible plastic tubing that has largely replaced rigid copper and CPVC in new construction and repipe jobs across Southern California. The cross-linking process improves the material’s resistance to temperature swings, pressure, and chemical exposure, and it does not pit, scale, or corrode the way metal pipe can over time.
Why Plumbers and Homeowners Like PEX
- Flexibility — PEX bends around corners and through wall cavities, which means fewer fittings and fewer potential leak points compared to rigid pipe.
- Freeze resistance — the tubing can expand up to three times its diameter, so it’s far less likely to split if water inside it freezes.
- No soldering or solvent welding — connections like the Uponor ProPEX system use expansion fittings, not glue or open flame, which speeds up installation and reduces fire risk during repipes.
- Corrosion resistance — unlike copper piping, PEX won’t develop pinhole leaks from acidic water or electrolysis.
PEX vs. Copper: Which Is Right for Your Home?
Copper has a long track record and is still a solid choice, but it costs more, takes longer to install, and can be vulnerable to corrosion in certain water conditions common in the San Gabriel Valley. PEX is generally the more budget-friendly option for a full repipe, and it tends to hold up better where water chemistry is a factor. If you’re trying to decide between the two, our guide on PEX vs. copper costs in California breaks down the price differences in more detail, and our PEX and copper piping FAQ covers the most common homeowner questions.
Signs Your Home Might Need a Repipe
- Frequent pinhole leaks in copper lines
- Rusty or discolored water, especially first thing in the morning
- Noticeably low water pressure throughout the house
- A home built before the 1980s that still has its original pipe
If any of that sounds familiar, it’s worth having a plumber take a look before a small leak turns into a wall full of water damage. We install both PEX and copper repipes across Pasadena, Arcadia, and the surrounding San Gabriel Valley, and we’re happy to walk you through which option makes sense for your specific plumbing setup. Give us a call if you want an honest opinion on your pipes.
