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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.
| Pick | Product | Connection | Size range | Standard |
|---|---|---|---|---|
| Best Cinch (DIY) | iCrimp PEX cinch tool | Stainless cinch clamp | 3/8″–1″ | ASTM F2098 |
| Best Copper Crimp | iCrimp/IWISS F1807 tool | Copper crimp ring | 3/8″–1″ | ASTM F1807 |
| Best for Repipes | Milwaukee M12 ProPEX | ProPEX expansion (cordless) | 3/8″–1″ | ASTM F1960 |
Best Cinch (Easiest for DIY): iCrimp PEX Cinch Clamp Tool
Size range 3/8″–1″ · standard ASTM F2098 · ratcheting one-hand cinch · includes 20× 1/2″ + 10× 3/4″ SS clamps + pipe cutter · solid metal body, textured grip
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.
- One-hand ratchet releases only when the clamp is fully seated — eliminates the under-crimped connection that causes drips.
- Covers all four common sizes (3/8″, 1/2″, 3/4″, 1″) with no jaw swaps.
- Kit bundles 30 stainless clamps and a pipe cutter — enough for a basic rough-in out of the box.
- Cinch clamps are easier to fit in tight spaces than copper crimp rings.
- F2098 cinch rings aren’t interchangeable with copper crimp rings (F1807) — you’re committed to one system.
- Solid metal construction adds weight on extended overhead work.
- 30-day money-back guarantee is thin versus a multi-year tool warranty.
Verdict: Best for homeowners or light-duty plumbers doing a fixture swap or bathroom addition who want one tool for every common PEX size.
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Best Copper Crimp: IWISS PEX Copper Crimp Ring Tool
Size range 3/8″–1″ (interchangeable jaws) · standard ASTM F1807 · kit includes crimper + removal tool + go/no-go gauge + PEX cutter + case · 2.8 lbs · 16″ handle
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.
- Go/no-go gauge included so every crimp can be verified on the spot — no guesswork on inspected work.
- 2.8 lb tool with 16″ handles gives good mechanical advantage; lighter than cordless alternatives.
- Interchangeable jaws cover 3/8″–1″ copper rings, compatible with Sioux Chief, Watts, and Nibco rings.
- F1807 copper crimp is the most widely code-accepted PEX connection method in the U.S.
- The page lists no specific model — the line has variants (IWS-FA, IWS-FAS) with slightly different kits; confirm the exact one.
- Changing jaw sizes mid-job adds a step that a cinch or expansion tool skips.
- 30-day return policy is shorter than tool-brand warranties.
Verdict: Best for the plumber or serious DIYer who wants a code-compliant copper-ring system with built-in quality verification at a fraction of a cordless tool’s cost.
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Best for Repipes: Milwaukee M12 PEX Tool
12V M12 · 2× 1.5Ah REDLITHIUM CP batteries · capacity 3/8″–1″ ProPEX (F1960) · 4.5 lbs · 60 strokes/min · 5-year tool warranty
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.
- Cordless at 60 strokes/min gives consistent expansion connections with zero hand fatigue on a full-house repipe.
- Auto-rotating head allows one-handed positioning; the right-angle body fits crawlspaces and stud bays.
- 5-year Milwaukee tool warranty — far longer than manual hand-tool guarantees.
- Works with all PEX-A pipe and ASTM F1960 expansion fittings, not locked to one brand.
- This is a ProPEX expansion tool (PEX-A / F1960), not a crimp-ring tool — it needs PEX-A pipe and F1960 fittings, which cost more than PEX-B barbed fittings.
- At 4.5 lbs with battery it’s heavier than a manual crimper; overkill for a 1–2 connection repair.
- Expansion heads are sold separately on the bare-tool SKU; the full kit costs significantly more.
Verdict: Best for licensed plumbers doing full repipes or new construction where speed and reduced hand fatigue across hundreds of connections matter most.
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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.
Related Plumbing Guides
- Best Pipe Cutters for Copper, PEX & PVC
- Best Push-to-Connect Fittings
- PEX vs Copper vs CPVC: Which Pipe Is Best?
- Essential Plumbing Tools (Complete Guide)
Got the tool? You still need pipe and fittings, see our picks for the best PEX tubing and fittings starter kit.
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