Using PEX Fittings To Install Better Plumbing Systems

PEX is a water plumbing system constructed from high density polyethylene tubes. Special PEX fittings are used to connect PEX tubing. PEX tubing is a flexible material that is easier and cheaper to install, is resistant to corrosion and requires fewer fittings than older plumbing systems.

The main advantages of PEX tubing is its ability to remain flexible in cold temperatures, its resistance to scale build-up and corrosion and its lower cost compared to metal or rigid pipes. PEX tubing is less expensive than copper pipe, requires less time to install and requires fewer fittings.

PEX tubing is stored on spools. Spools weigh less than metal or rigid plastic pipe making them less expensive to ship and easier to store. When used in an installation, PEX tubing can be unrolled directly from the spool and does not require coupling fittings. This saves the time and expense of running pipe. PEX tubing can be turned 90 degrees eliminating the need for elbow fittings. PEX tubing does not need to be soldered so there are no unhealthy fumes and dangers posed by using a torch.

There are a variety of connection methods used in installing PEX fittings. Some of these methods are proprietary and some require special tools. Basically, the fitting is inserted over the tube or in the tube and then a ring or clamp is crimped around the tube or fitting forming a tight fit. The rings can be made of various metals or plastic depending on he connection method.

Three basic tools are required for the standard crimping method when working with PEX: a main crimping tool, a pipe cutter, and a de-crimping tool. The pipe cutter tool cuts the tube before putting it into the fitting. There are a variety of main crimping tools available which can crimp 1/2" or 3/4" tubes. A de-crimping tool is used to remove the copper crimp ring from the tube and fitting.

Fittings are usually made of brass, although there are some made of bronze, copper and engineered plastic fittings for PEX. There are characteristic ridges on the "insert" part of the fitting. The ridges, the PEX tube and the crimped copper ring all work together to form a high-pressure seal.

It is clear that using PEX tubing with PEX fittings has important advantages over metal and rigid plastic systems. It costs less. It is easier and faster to install. Its resistance to corrosion and scale makes it last longer.