A PEX crimp tool is one of the most useful tools for installing PEX plumbing systems. Whether you’re working on a home plumbing project, repairing a water line, or installing new PEX tubing, the right crimp tool can help create secure and reliable connections.
But how does a PEX crimp tool work, and what should you consider before choosing one?
In this guide, we’ll explain everything you need to know about PEX crimp tools, including how they work, the different types available, how to use one, and common mistakes to avoid.
What Is a PEX Crimp Tool?
A PEX crimp tool is a hand-operated plumbing tool used to connect PEX tubing to compatible fittings with a crimp ring.
PEX, short for cross-linked polyethylene, is widely used for residential water-supply plumbing because it is flexible, relatively easy to install, and resistant to corrosion.
A typical PEX crimp connection consists of three main components:
- PEX tubing
- A compatible PEX fitting
- A crimp ring
The crimp tool compresses the ring around the tubing and fitting, creating a secure mechanical connection.
How Does a PEX Crimp Tool Work?
Using a PEX crimp tool is relatively straightforward when the correct components are used.
First, the crimp ring is placed over the end of the PEX tubing. The appropriate fitting is then inserted into the tubing. The ring is positioned over the fitting’s connection area.
The jaws of the crimp tool are placed around the ring, and the handles are squeezed to compress it. The resulting connection should meet the requirements of the particular PEX system and applicable plumbing standards.
Always follow the tool and fitting manufacturer’s instructions because connection requirements can vary.
Types of PEX Crimp Tools
PEX crimp tools come in several designs.
Standard PEX Crimp Tool
A standard hand crimp tool is suitable for many basic plumbing projects. It usually has handles and interchangeable or fixed jaws designed for specific crimp-ring sizes.
These tools are often affordable and simple to operate.
Ratcheting PEX Crimp Tool
A ratcheting crimp tool uses a ratcheting mechanism that helps maintain consistent pressure during the crimping process.
The mechanism typically prevents the tool from being opened until the crimp cycle is completed. This can make it easier for beginners to produce consistent connections.
Multi-Size PEX Crimp Tool
Some tools are designed to work with multiple crimp-ring sizes. This can be convenient if your plumbing project uses different tubing diameters.
Before purchasing a multi-size tool, confirm that its jaws are compatible with the specific crimp rings you’re using.
Compact PEX Crimp Tool
Compact models have shorter handles and a smaller overall profile. They’re useful when working in confined spaces, although they may require more hand force than a longer-handled tool.
How to Use a PEX Crimp Tool
The exact process depends on the manufacturer’s instructions, but a typical crimp connection involves these steps.
1. Cut the PEX Tubing
Use a proper PEX tubing cutter to make a clean, square cut. A crooked or damaged cut can interfere with the fitting connection.
2. Install the Crimp Ring
Slide the crimp ring onto the tubing. Position it according to the fitting manufacturer’s specifications.
3. Insert the Fitting
Push the compatible fitting into the PEX tubing until it reaches the required insertion point.
4. Position the Tool
Place the crimp tool jaws over the crimp ring. Make sure the jaws are correctly aligned with the ring.
5. Make the Crimp
Squeeze the handles firmly until the connection is properly crimped. If you’re using a ratcheting model, complete the tool’s full crimp cycle.
6. Inspect the Connection
Inspect the crimp visually and use the appropriate gauge when required by the tool or fitting manufacturer.
If the connection doesn’t meet the required specifications, don’t assume it is safe simply because the ring appears tight.
What Size PEX Crimp Tool Do You Need?
PEX crimp tools are commonly available for different tubing sizes, including 3/8-inch, 1/2-inch, 3/4-inch, and 1-inch, although availability varies.
The important point is that the tool must match the crimp ring and fitting system you’re using.
For example, if your project uses 1/2-inch PEX tubing, you need a crimp tool designed for the appropriate 1/2-inch crimp ring system.
Don’t select a tool based only on the tubing diameter. Check compatibility among the tubing, fitting, crimp ring, and tool.
PEX Crimp Tool vs. PEX Clamp Tool
PEX crimp and PEX clamp systems use different connection methods.
A PEX crimp tool compresses a crimp ring around the tubing and fitting. A PEX clamp or cinch tool tightens a stainless-steel clamp around the connection.