1. PEX
Flexible, quick to install and resistant to freeze damage. It bends around corners, so fewer fittings are needed. It should not be exposed to direct sunlight and needs crimp, clamp or expansion fittings.
2. Copper
Long-lasting and heat tolerant, copper is a good choice for exposed runs and water heater connections. Joining it usually means soldering, although push-to-connect fittings also work.
3. CPVC
Rigid plastic pipe joined with solvent cement. It is inexpensive and easy to cut, but it becomes brittle with age and in cold conditions, so handle older lines with care.
4. Mixing materials
Transition fittings and push-to-connect couplings let you join PEX, copper and CPVC. Use them when extending or repairing an existing system rather than replacing it all.
Parts for this job: Pipe & Fittings.
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