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PEX vs. Copper vs. CPVC: When to Use What (+ Fittings Cheat Sheet)

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PEX vs Copper vs CPVC
Guide

PEX vs. Copper vs. CPVC: When to Use What (+ Fittings Cheat Sheet)

Confused about pipe types? Here’s a simple homeowner’s guide to the three common options—what they’re good at, where they struggle, and which fittings you’ll need.

Quick comparison

Pipe Pros Watch-outs Typical Use
PEX (A/B) Flexible, fewer joints, freeze-friendly Needs special tools; avoid UV exposure Repairs, remodels, long runs with few fittings
Copper (Type L/M) Durable, heat-tolerant, time-tested Soldering skill; cost; pinhole corrosion in some water Near water heaters, stubs, high-temp/visible runs
CPVC Budget-friendly, solvent-welded, heat-tolerant Brittle if stressed/UV exposed; primer/cement required Straight, indoor runs with good support

Fittings cheat sheet

Starter fittings for a small repair (use as a shopping checklist later).

System Essential fittings/tools Link
PEX Couplings, tees, elbows, crimp rings, cutter, deburr tool (add link later)
Copper Elbows/tees, couplings, emery cloth, flux, solder, torch (add link later)
CPVC Elbows/tees, couplings, CPVC primer & cement, cutter (add link later)

Pick the right pipe for the job

  • In a tight cabinet? PEX is forgiving and quick.
  • Near a water heater or visible stub-outs? Copper looks clean and handles heat well.
  • Straight basement/attic runs? CPVC can be cost-effective if supported and protected.
Next: See the Leak-Stop Kit for thread sealing & supply-line swaps, or head to Start Here.
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fittings cheat sheet cpvc copper pex

About the author

Jaz McBean
JM

Jaz McBean

Author • Fix Flow Parts

Jaz McBean is the house-call plumber you don’t have to call. After years of fixing the same leaks and running toilets over and over, Jaz started Fix Flow Parts to show homeowners exactly which parts to buy and how to install them. Think of Jaz as the friend who hands you the right wrench, points to the right valve, and says, “Do this next.”