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If you’re a plumber or a serious DIYer, you know that PEX tubing has revolutionized residential and commercial plumbing. But the real game-changer is the cordless PEX press tool. Powered by lithium-ion batteries, these tools let you make secure, leak-proof connections in seconds—without the hassle of soldering, glue, or heavy crimping tools. In this guide, we’ll walk you through how to use a PEX press tool, from selecting the right battery system to mastering the pressing motion, and highlight some essential accessories that make your job easier.

What Is a PEX Press Tool and Why Go Cordless?

A PEX press tool uses interchangeable jaws to compress a copper or stainless steel ring around PEX tubing and a fitting, creating a permanent, watertight seal. Cordless versions, especially those compatible with the M18 platform, offer unmatched portability. You can work in tight crawlspaces, on ladders, or in new construction without dragging an air compressor or searching for a power outlet. The freedom of cordless operation also speeds up installations—no extension cords, no waiting for heat-up time, just press and move on.

For demanding jobs, a reliable battery platform is critical. The M18 18V Lithium-Ion Dual Bay Rapid Battery Charger w/ (2) 8Ah HIGH OUTPUT Batteries provides the runtime needed for a full day of pressing. With 8Ah capacity, these batteries keep your press tool operating at peak performance, reducing downtime. The rapid charger ensures you’re back in action quickly during lunch breaks or between jobs.

Step-by-Step: How to Use a Cordless PEX Press Tool

Step 1: Prep the Tubing and Fitting

Cut your PEX tubing squarely using a dedicated PEX cutter. Ensure the cut end is clean and free of debris. Slide the appropriate-sized copper or stainless steel press ring onto the tubing, leaving at least 1/4 inch of tubing protruding beyond the ring. Insert the fitting (brass or plastic) fully into the tubing until it stops against the ring.

Step 2: Select and Install the Correct Jaw

Most cordless press tools accept interchangeable jaws for sizes like 1/2-inch, 3/4-inch, and 1-inch. Match the jaw to the ring size. Snap the jaw onto the tool’s head—it should click securely into place. Ensure the jaw is fully closed around the ring before pressing.

Step 3: Position and Press

Place the jaw over the ring, making sure it’s centered and perpendicular to the tubing. Squeeze the trigger. The tool will automatically retract once the press cycle is complete—usually within 3–5 seconds. You’ll hear a distinct click or see a green indicator light (on advanced models) confirming a successful press. For some systems, you may need to rotate the tool slightly to ensure even compression.

Step 4: Inspect the Connection

After pressing, visually check the ring for uniform deformation. It should be evenly compressed with no gaps. A proper press ring will have a distinct “ear” or flat sides, depending on the brand. If the ring looks uneven, remove it and start with a new ring—never reuse press rings.

Pro Tips for Faster, Safer Installations

• Use a depth gauge: Many PEX cutters include a built-in depth gauge to mark the correct insertion depth. This prevents under-insertion, which can cause leaks.
• Keep your jaws clean: Debris on the jaw faces can cause incomplete presses. Wipe them down after each use.
• Battery management: For extended jobs, carry at least two high-capacity batteries. The M18 18V Lithium-Ion Dual Bay Rapid Battery Charger w/ (2) 8Ah HIGH OUTPUT Batteries ensures you always have a charged backup.
• Practice on scrap: If you’re new to press tools, make a few practice connections on scrap PEX to get a feel for the tool’s weight and cycle time.

Essential Accessories for PEX Plumbing Jobs

While the press tool is the star, a few accessories can dramatically improve your workflow. For example, a compact tape measure like the Compact 25 ft. SAE Tape Measure with Fractional Scale and 9 ft. Standout helps you measure tubing runs accurately. Its fractional scale is a lifesaver when laying out manifold systems or running lines through joists.

Safety is also paramount. When cutting tubing or pressing in tight spaces, eye protection is non-negotiable. The Tinted Safety Glasses Anti-Scratch Lenses (3-Pack) offers durable, anti-scratch lenses that reduce glare in bright conditions—perfect for outdoor or sunlit basement work. Keep a pack in your tool bag to always have a clean pair ready.

Comparing PEX Press Systems: Expander vs. Crimp vs. Clamp

System	Tool Type	Best For	Connection Strength
Expander (ProPEX)	Cordless expander tool	PEX-A tubing (e.g., Uponor)	Very high; shape-memory fit
Crimp (Copper Ring)	Cordless press tool	PEX-B tubing (common in US)	High; requires exact ring size
Clamp (Stainless Steel)	Cordless press tool	PEX-B, some PEX-C	Good; easier to remove later

Cordless press tools work with all three systems if you have the correct jaws. The expander method is especially popular for its ability to create a tighter, more durable seal—ideal for cold climates where PEX can contract.

Common Mistakes and How to Avoid Them

• Using the wrong jaw size: Always double-check that the jaw matches the ring diameter. A 3/4-inch jaw on a 1/2-inch ring will fail.
• Not fully inserting the fitting: Partial insertion leads to leaks. Use a depth gauge or mark the tubing with a permanent marker.
• Pressing too quickly: Some users release the trigger early. Wait for the tool to complete its full cycle—listen for the click.
• Neglecting battery charge: A low battery can cause an incomplete press. Swap batteries before the tool slows down.

Why Milwaukee’s M18 Platform Is Ideal for PEX Press Tools

Milwaukee’s M18 battery system is the industry standard for cordless trade tools. With high-output cells that deliver consistent power even under heavy load, your press tool will cycle quickly without overheating. The system’s compatibility across hundreds of tools means you can share batteries between your press tool, drill, saw, and even your M18 18V Lithium-Ion Cordless Compact Blower (Tool-Only) for cleaning up after plumbing work. That kind of ecosystem efficiency saves time and money.

Final Thoughts: Upgrade Your Plumbing Workflow

Switching to a cordless PEX press tool is one of the best investments you can make for faster, cleaner, and more reliable plumbing installations. Pair it with high-capacity batteries like the M18 8Ah HIGH OUTPUT pack, and you’ll press hundreds of connections on a single charge. Don’t forget the small essentials—a good tape measure and safety glasses keep you accurate and safe on every job.

Ready to speed up your next plumbing project? Check out the Compact 25 ft. SAE Tape Measure with Fractional Scale and 9 ft. Standout to ensure precise measurements every time—then upgrade your press tool setup for maximum efficiency.