PEX Expansion Tool: Best Manual and Cordless PEX-A Expanders

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Quick answer from a licensed plumber: A PEX expansion tool stretches PEX-A pipe and its ring so an ASTM F1960 fitting, such as Uponor ProPEX, can slide in; the pipe then shrinks back and seals. Use it on PEX-A only. For a bathroom or a few repairs, a manual kit like iCrimp’s IWS-F1960D is enough. For repipes, 1 inch pipe and cold weather, buy a cordless expander that auto-rotates its head, and check which heads it takes before you buy.

Our pick for most people: iCrimp’s (IWISS) manual PEX-A expansion kit, with 3/8, 1/2, 3/4 and 1 inch heads, a cutter and a ring removal tool, sold by the maker’s own Amazon storefront. Check the iCrimp (IWISS) PEX-A expansion kit on Amazon

PEX Expansion Tool Quick Picks

• Best manual PEX expansion tool: iCrimp (IWISS) PEX-A expansion kit, 3/8 to 1 inch, sold by the maker’s storefront.
• Best basic three-head kit: iCrimp F1960 PEX expansion tool kit, 1/2 to 1 inch.
• Best cordless to 1 inch on Amazon: RIDGID RPE 100 PEX expander, 12V, tool only.
• Best cordless to 1-1/2 inch: DeWalt DCE410P1 PEX expander kit, 20V MAX.
• Uponor’s cold-weather pick: Milwaukee M12 FUEL ProPEX expander 2532-22, from a supply house (see below).

What Is a PEX Expansion Tool?

A PEX expansion tool, also called a PEX expander, stretches the end of PEX-A pipe and a PEX reinforcing ring so an expansion fitting can slide in. Then the pipe does the work. Uponor describes it this way: the shape memory of its PEX pipe forms a tight seal around the fitting. The fittings and rings are covered by ASTM F1960, the standard for cold expansion fittings with PEX reinforcing rings. Uponor’s version is called ProPEX, which is why you will see “ProPEX expansion tool” on Milwaukee’s boxes.

The tool has an expander head for each pipe size. Each pull of the trigger, or squeeze of the handles, opens the head’s segments and stretches the pipe a little more. You repeat until the pipe and ring sit against the shoulder of the head, pull the tool, and push the fitting in. Expansion is a PEX-A method. If your pipe is PEX-B, you want a PEX crimp or clamp tool instead.

PEX Expansion Tools Compared

From the iCrimp, RIDGID, DeWalt and Milwaukee documents and listings in the sources below, read on October 2, 2026. Warranty is “not listed” where we found no published term.

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Milwaukee M12 FUEL ProPEX Expander: The Uponor Pick

If you install Uponor, this is the tool Uponor points to. Uponor’s installation guide lists Milwaukee’s M12, M12 FUEL, M18, M18 FUEL and M18 FORCE LOGIC expanders, plus its own ProPEX 201 corded and hand expanders. For cold-weather work on 3/8 to 1 inch, Uponor recommends the M12 FUEL ProPEX expander with RAPID SEAL heads. Milwaukee says those heads give up to 65% faster sealing at 45 degrees, which shortens the wait before pressure testing.

Milwaukee lists the 2532-22 kit at 3/8 to 1 inch capacity, 4.54 lb, with an auto-rotating head, a right-angle body and a 5-year limited tool warranty. The kit comes with 1/2, 3/4 and 1 inch RAPID SEAL heads, two M12 batteries, a charger and cone grease. I use Milwaukee tools on jobs, and this is the expander I would steer an Uponor installer to. On October 2, 2026, we found no Amazon listing for the kit sold by Amazon or Milwaukee with enough stock to link, so buy it from a plumbing supply house. Milwaukee’s RAPID SEAL heads, such as the 1/2 inch 49-16-2414, were also offered on Amazon only by third-party sellers, so we do not link them. For the head-to-head with DeWalt, see DeWalt vs Milwaukee PEX expander.

Is a PEX Expansion Tool Only for PEX-A?

Yes, in practice. Milwaukee’s manual says to use the tool only to expand PEX-a, because other materials may split or crack and leak. RIDGID’s manual says the same, and so does DeWalt’s DCE400 manual. Uponor explains why: PEX-b and PEX-c have a lower and less uniform degree of crosslinking, so the pipe wall can stress-crack during expansion. SharkBite says its expansion fittings must be used with PEX-A pipe and expansion rings.

The one exception in our sources is DeWalt’s DCE410 manual, which says it is for ASTM F1960 approved PEX-A and PEX-B. Uponor approves its pipe for a fitting system only when that fitting standard is marked on the pipe’s print string. If your pipe’s print string does not list F1960, do not expand it; use crimp or clamp fittings. Not sure what you have? PEX-A vs PEX-B explains how to tell, and PEX crimp vs clamp covers the PEX-B side.

ProPEX Heads: Uponor, Milwaukee, RIDGID and DeWalt

Heads are where the brands lock you in, so check them before you buy a tool.

• Milwaukee tools: per Uponor, standard Uponor heads fit Milwaukee’s M12 and M18 expanders but do not auto-rotate on them; only Milwaukee heads auto-rotate. Uponor H-heads do not fit Milwaukee tools. Milwaukee’s 2432 manual says to rotate the tubing 1/8 turn after each expansion when using Uponor standard heads.
• Uponor tools: Milwaukee heads do not fit them, per Uponor.
• DeWalt: DeWalt says its DCE400 uses DeWalt heads and is compatible with Milwaukee and Uponor heads. The DCE410 takes DeWalt’s 3/8 to 1 inch heads plus its own 1 to 1-1/2 inch heads.
• RIDGID: RIDGID makes 3/8, 1/2, 5/8, 3/4 and 1 inch heads for the RPE 100 and says to use only RIDGID or RIDGID-approved heads.
• Manual kits: heads come with the tool and fit only that tool.

Manual vs Cordless PEX Expansion Tools

A manual tool is enough for most homeowners. It needs no battery, and for a bathroom or a few repairs the extra effort is small. The cost shows up on 1 inch pipe, where the charts call for the most expansions per joint: 17 to 18 on Milwaukee’s M12 chart. Uponor’s table gives no 1 inch count for its own hand tool. A manual tool also leaves the rotation to you unless its heads index, which iCrimp says its kits do.

Cordless tools make sense on a repipe, on 1 inch and larger pipe, and in cold weather. Every cordless tool on this page auto-rotates its own heads. Rotation matters: Uponor says that failing to rotate between expansions leaves deep grooves in the pipe that can become leak paths. For 1-1/4 inch and up, you need a cordless tool. In our picks, that means DeWalt’s DCE410 to 1-1/2 inch. Milwaukee’s M18 tools go further, to 3 inch on the M18 FORCE LOGIC per Uponor. If you are pricing out a repipe, see what a repipe costs.

PEX Expansion Head Sizes and Expansion Counts

Every pipe size needs its own head. Residential work is mostly 1/2, 3/4 and 1 inch, which is what most kits include. The 3/8 and 5/8 inch heads are usually sold separately. The number of expansions per joint depends on the tool and head:

From Uponor’s Table 2 (at 73.4°F) and the Milwaukee, DeWalt and RIDGID manuals. Uponor’s column is its manual (hand) expander. SharkBite’s guide gives about 6, 8 and 5 expansions for 1/2, 3/4 and 1 inch (its 1 inch count is far below every chart above, so on 1 inch go by the shoulder test), and DeWalt’s DCE410 manual gives its own counts for its 1 to 1-1/2 inch heads. Every maker says the real number changes with temperature and technique. The test is the result: the pipe and ring snug against the head’s shoulder, and the fitting going in with some resistance.

Expansion Rings

The ring goes on before you expand. Slide it over the pipe until the pipe end hits the ring’s stop. If the ring has no stop, leave it overhanging the pipe end by no more than 1/16 inch, per Milwaukee, DeWalt, RIDGID and Uponor (SharkBite allows up to 1/8 inch). The 3/8 inch rings are thicker. Uponor and Milwaukee say to expand each side of a 3/8 inch ring once before it will fit over the pipe, then work fast, because 3/8 inch rings shrink faster than other sizes.

Match the ring to the pipe. Uponor cautions against using its ProPEX rings on other makers’ pipe, or other makers’ rings on its pipe, and says its 25-year warranty requires Uponor pipe with Uponor ProPEX rings and fittings. For fittings, see brass vs poly PEX fittings.

How to Make a PEX Expansion Joint

1. Cut square. Use a PEX cutter and cut perpendicular to the pipe. See the best PEX cutters, or our pipe cutter guide for copper and other pipe.
2. Grease the cone, not the pipe. A thin coat on the tool’s cone with a lint-free cloth. Too much or too little grease can cause faulty connections, per Milwaukee. Wipe any grease out of the pipe.
3. Ring on. Slide it to the stop, or to no more than 1/16 inch overhang.
4. Expand. Insert the head and expand until the pipe and ring are flush with the head’s shoulder. With a manual tool or Uponor standard heads, rotate 1/8 turn between expansions. Hold the pipe and ring so they do not spin with an auto-rotating head.
5. Do not hold it open. Remove the tool with the segments closed. Holding the pipe in the expanded position over-expands it, per Milwaukee, DeWalt and Uponor.
6. Insert the fitting right away. Push it in to the fitting shoulder. You should feel some resistance. If you feel none, Uponor says the pipe may be over-expanded and will take longer to shrink. If the fitting will not go in, pull it and expand once more.
7. Check the gap. More than 1/16 inch between the pipe and ring and the fitting shoulder means the joint must be redone. Cut 2 inches off and start over with a new ring.

Uponor also sets a minimum pipe length between ProPEX fittings: 2 inches for 1/2 inch, 3 inches for 3/4 inch and 3-1/2 inches for 1 inch. It recommends a residential pressure test at 25 psi above working pressure or 100 psi, tested to local code.

Cold-Weather PEX Expansion

Cold is where expansion joints go wrong. Below 40°F, Milwaukee, DeWalt and Uponor all say to use fewer expansions, and the pipe takes longer to shrink onto the fitting. Milwaukee, DeWalt and iCrimp say not to make connections below 5°F, and RIDGID lists 14°F as the bottom of the RPE 100’s operating range. Uponor’s tips: keep fittings and rings warm in your pockets, and never use a heat gun on EP fittings to speed things up. For 3/8 to 1 inch in the cold, Uponor recommends Milwaukee’s M12 FUEL with RAPID SEAL heads. Give a cold joint time to recover before you pressure test it.

Common PEX Expansion Mistakes

• Over-expanding. Extra strokes, or holding the tool open, stretch the pipe so it takes longer to seal.
• Grease or sweat on the pipe. Uponor says oils from your hands can let the ring slide down the pipe during expansion, and grease in the pipe can let the head slip out.
• Not rotating. With a manual tool or Uponor heads on a Milwaukee tool, rotate between expansions or you get grooves.
• Damaged heads. Uponor lists bent segment fingers as a cause of fittings that will not seal. If the head will not close fully, replace it.
• Assuming fittings cannot be reused. Uponor says brass ProPEX fittings can be reused; its EP fittings cannot.

FAQ

What is a PEX expansion tool?

A tool that stretches the end of PEX-A pipe and its reinforcing ring so an ASTM F1960 expansion fitting, such as Uponor ProPEX, can slide in. The pipe then shrinks back onto the fitting and seals it. Manual tools work by squeezing handles. Cordless tools expand on a trigger pull.

Can you use a PEX expansion tool on PEX-B?

Do not. Milwaukee, RIDGID and DeWalt’s DCE400 manual say to use their expanders on PEX-a only. Uponor warns that PEX-b and PEX-c pipe can stress-crack during expansion because of lower and less uniform crosslinking. DeWalt’s DCE410 manual is the outlier and lists F1960 approved PEX-B. Use crimp or clamp fittings on PEX-B.

Is a manual PEX expansion tool good enough?

For a bathroom, a kitchen or repairs, yes. Uponor’s own guide still covers its hand expander. Cordless tools make sense for repipes, 1 inch and larger pipe, and cold weather, where the charts call for many expansions per joint (17 to 18 for 1 inch on Milwaukee’s M12 chart).

What is the difference between a ProPEX tool and a PEX expansion tool?

ProPEX is Uponor’s name for its ASTM F1960 cold-expansion fittings and rings, so a ProPEX expansion tool is an F1960 expander. Milwaukee’s M12 and M12 FUEL tools are built for Uponor ProPEX. iCrimp says its F1960 kits also work with other makers’ F1960 systems. Uponor’s full warranty needs Uponor pipe with Uponor ProPEX rings and fittings.

Do Uponor heads fit Milwaukee expanders?

Yes, standard Uponor heads fit the Milwaukee M12 and M18 tools, but they will not auto-rotate on them, per Uponor. Uponor H-heads do not fit Milwaukee tools, and Milwaukee heads do not fit Uponor tools. DeWalt says its DCE400 takes DeWalt, Milwaukee and Uponor heads. RIDGID says to use only RIDGID or RIDGID-approved heads on the RPE 100.

How cold is too cold for PEX expansion?

Milwaukee, DeWalt and iCrimp say not to make expansion connections below 5°F. RIDGID lists a 14°F to 104°F operating range for the RPE 100. Below 40°F, the makers say to use fewer expansions and allow a longer contraction time. Uponor suggests keeping fittings and rings warm in your pockets.

Can you reuse a PEX expansion fitting?

Brass ProPEX fittings can be disconnected and reused, per Uponor. Its engineered polymer (EP) fittings must be discarded. If a joint is bad, Uponor says to cut the pipe 2 inches from the fitting for 3/8 to 1 inch pipe and start over with a new ring.

Why Trust Plumbing Picks

Plumbing Picks is written by a licensed Georgia journeyman plumber who uses Milwaukee, RIDGID and DeWalt tools on jobs. Every size, count, temperature and rule here comes from the Uponor, Milwaukee, DeWalt, RIDGID, SharkBite and iCrimp documents listed below, from the ASTM F1960 scope page, or from the Amazon listings we link. Nothing here comes from hands-on testing. On October 2, 2026, every linked listing was in stock. The RIDGID and DeWalt listings were sold by Amazon.com, and the iCrimp kits by iCrimp’s own storefront. We link only listings sold by Amazon.com or the tool maker’s own storefront. If you buy through a link we may earn a commission at no extra cost to you. Nobody pays to be included here. More on who writes this and how we pick.

Sources

• Uponor: PEX Piping Systems Installation Guide (10/25), ProPEX connections, Table 2 expansion counts, cold weather, troubleshooting, Uponor: Residential Plumbing Installation Guide (11/24), other manufacturers’ pipe and rings, Uponor: Tools page (Milwaukee ProPEX expander head compatibility note)
• Milwaukee: M12 FUEL ProPEX Expander Kit 2532-22, Milwaukee: M12 ProPEX Expansion Tool Kit 2432-22, Milwaukee: 2432-20 operator’s manual
• DeWalt: DCE400B 20V MAX 1 in. PEX Expander, DCE400 instruction manual, DeWalt: DCE410P1 20V MAX XR 1-1/2 in. PEX Expander Kit, DCE410 instruction manual
• RIDGID: RPE 100 PEX Expander operator’s manual and catalog sheet R-25-D (RIDGID documents, copies hosted by a plumbing retailer; ridgid.com blocked our reader)
• SharkBite: PEX-A Installation Guide for Expansion, Crimp, Clamp and EvoPEX fittings (2021), iCrimp: IWS-F1960 hand expander kit page, iCrimp: IWS-F1960D kit instructions
• ASTM F1960, Cold Expansion Fittings with PEX Reinforcing Rings (scope page)
• Amazon listings linked on this page (titles, listing bullet points, seller and stock read on October 2, 2026)

Bottom Line

Buy a PEX expansion tool only for PEX-A pipe, and match the heads and rings to the system you install. A manual kit with 1/2, 3/4 and 1 inch heads covers most house work. Go cordless for repipes, 1 inch and up, and winter jobs. Pick by head system and battery platform: RIDGID or DeWalt from Amazon, or Milwaukee from a supply house if you install Uponor ProPEX.