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PEX made plumbing DIY-friendly, but a connection is only as good as the tool that makes it. There are two systems: copper crimp rings (need a crimp tool) and stainless cinch clamps (need a cinch tool). Both work great — the cinch system is usually easier and cheaper for homeowners and fits tighter spaces.
Here’s what I’d buy depending on which ring system you use, plus a pro option if you’re repiping a whole house.
Best Cinch (Easiest for DIY): iCrimp PEX Cinch Clamp Tool
For most homeowners, the cinch system wins: one tool handles all PEX sizes (3/8″ to 1″), the clamps are forgiving, and the tool fits into tight spots a crimper can’t. The iCrimp cinch tool is inexpensive, ratcheting, and reliable. If you’re starting fresh with PEX, this is the simplest path to leak-free joints.
Best Copper Crimp: IWISS PEX Copper Crimp Ring Tool
If you’re using copper crimp rings (common with PEX-B), a dedicated crimp tool compresses the ring evenly around the fitting. The IWISS ratcheting crimper with a go/no-go gauge lets you confirm each crimp is correct. Get the combo 1/2″ + 3/4″ model since those are the sizes you’ll use most.
Best for Repipes: Milwaukee M12 PEX Tool
Doing a whole-house repipe or a lot of PEX? A cordless tool like the Milwaukee M12 makes consistent connections in seconds without hand fatigue, and removes the guesswork. It’s a pro-priced tool, but for volume work it’s faster and more consistent than any manual crimper.
How to Make a Leak-Free PEX Connection
- Cut the PEX square with a PEX cutter — a clean, perpendicular cut is essential for a good seal.
- Slide the ring or clamp onto the tubing, then push the fitting fully into the pipe until it bottoms out.
- Position the ring/clamp about 1/8″ to 1/4″ from the end of the tubing (follow the fitting maker’s spec).
- Crimp or cinch in one firm motion — for crimp rings, use the go/no-go gauge to confirm the ring diameter is correct.
- Pressure-test the line before closing up walls. A bad crimp shows up fast under pressure, not months later.
FAQ
PEX crimp or cinch — which is better?
Both make reliable, code-approved connections. Cinch (stainless clamp) tools are usually cheaper, handle all PEX sizes with one tool, and fit tighter spaces — better for most DIYers. Copper crimp rings can be slightly lower-profile and are common on PEX-B systems but need size-specific tooling. Pick one system and stick with it.
Do I need a different tool for each PEX size with crimp rings?
Traditional copper-ring crimpers are size-specific (you need the right jaw for 1/2″ vs 3/4″), though combo tools cover both common sizes. Cinch (clamp) tools, by contrast, work across all PEX sizes with a single tool — one reason they’re popular with homeowners.
How do I know if my PEX crimp is good?
Use the go/no-go gauge that comes with crimp tools — it checks that the crimped ring is the correct final diameter. For cinch clamps, confirm the tab is fully closed and the clamp is seated near the fitting. Either way, always pressure-test the system before sealing up walls.
Bottom Line
For most homeowners, the iCrimp cinch tool is the easiest path to leak-free PEX — one tool, all sizes, tight-space friendly. Using copper crimp rings? Get the IWISS crimper with a gauge. Repiping a house? The cordless Milwaukee M12 saves your hands and guarantees consistency. Whichever you choose, cut square and pressure-test.