pex clamp connection

The clamp connection method uses a stainless-steel ring on the outside of the pipe with an insert fitting going into the pipe.

To make a proper connection, the installer must first ensure the tool is properly calibrated. Then, the process is similar to a crimp connection: Start with a clean, straight cut on the end of the pipe, slide the ring over the pipe, insert the fitting and position the ring back over the pipe and fitting (again, the position depends on the manufacturer). After properly positioning the ring, use a clamp tool to compress the ring until the tool stops. Most tools won’t release until the connection is complete.

Like crimp connections, clamp connections are fast and easy to learn, quick to install and the products are readily available at a variety of retailers. However, clamp connections offer a slight advantage as they only require one tool for any size connection. There’s no need to purchase separate heads for different pipe sizes. Also, the clamp connection is easier to disassemble than a crimp connection if the connection needs to be removed.

The downside is that, just like the crimp method, it goes against the properties of PEX. As time goes on, the pipe will continue to resist the strength of the ring around it. Because fittings with a smaller internal diameter are inserted into the pipe, it creates restriction to water flow.

Like crimp connections, the clamp connection is approved for installation behind walls and direct burial in soil. And while the stainless-steel rings are not corrosion-resistant, they have the potential to provide slightly more resistance to corrosion compared to copper crimp rings.

Another important note: Calibrating the tool is important. A miscalibrated tool will result in leaks or damaged fittings. Manufacturers’ recommendations vary on how often to calibrate the tool, so be sure to follow the proper calibration frequency.