What Is PEX Pipe?
PEX pipe is flexible plastic tubing used to carry hot and cold water through plumbing systems. Cross-linked polyethylene gives PEX pipe flexibility, resistance to corrosion, and simple routing around framing. Plumbers connect it with approved fittings, so it can serve supply lines in homes and many water line replacement projects.
Quick Facts About PEX Pipe
Category
Water supply tubing
Used for
Hot and cold water lines
Common confusion
PEX is not PVC
Also called
Cross-Linked Polyethylene Pipe, PEX tubing
Often discussed with
Water Line Replacement
Key Takeaways About PEX Pipe
- Its flexibility helps it follow direct routes through walls and floors.
- PEX carries hot and cold water through supply lines.
- PEX is not the same material as PVC pipe.
How PEX Pipe Works
PEX pipe carries pressurized water through a home’s supply system. Its flexible walls let installers make smooth turns and route tubing through tight spaces. The tubing comes in different sizes for different water flow needs.
Related glossary terms: Pipe Fitting, Shutoff Valve.
Special fittings join PEX sections to valves, fixtures, and other pipe materials. Common connection methods include crimp, clamp, and press fittings. Each method needs the correct fitting and tool. A water line replacement may use PEX from an accessible connection point to a fixture or branch line.
How PEX Pipe Differs From Rigid Pipe
Rigid pipe needs more elbows to change direction. PEX can follow a curved path, which may reduce the number of connections in a water line. PEX also does not rust like metal pipe, but fittings still need careful installation and inspection.
Expert Note
When we work on water line replacement, we check the existing pipe, access points, and connection locations. We route PEX to limit sharp bends and protect each fitting from strain. Our team also checks the completed line for leaks before the work is finished.
PEX Pipe in Practice: A Real-World Example
A water line replacement may remove a damaged section beneath a sink and connect new PEX pipe to the existing supply line. The installer routes the tubing through the cabinet and secures fittings at the shutoff valve and faucet connections.
Related Services
Related Terms
Pipe Fitting
A pipe fitting is a plumbing component that joins, redirects, extends, reduces, or ends a pipe…
Shutoff Valve
A shutoff valve is a plumbing control that stops water flow through a pipe or fixture…
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