How PEX Water Pipes Are Connected

As an alternative or replacement for copper plumbing pipe, PEX has become widely accepted for carrying pressurized water to fixtures throughout your home. PEX is also more flexible than copper and can be bent for tight turns.

PEX is made from cross-linked HDPE (high-density polyethylene), which means its molecular structure is permanently linked to form a durable, high-performing plumbing pipe that is safe for drinking water. PEX tubing is rated by its material designation code, chlorine resistance, UV resistance and pressure rating.

Unlike copper pipes, which need to be soldered and joined together, all PEX connections are made using push-fit fittings, stainless steel clamps or thermal expansion. The push-fit method is the quickest, requiring no tools other than a pair of PEX pliers to remove a removal ring once the fitting has been installed. However, push-fit fittings don't offer as strong a connection and tend to wear out faster than the other two methods of making PEX connections.

A clamp is placed around the end of a piece of pipe, then squeezed shut with a special PEX tool. Clamps provide a more secure connection but require more tools to install and take up more space. Finally, thermal expansion is used to connect PEX tube to a fitting by heating it with a heat gun to expand it so it slips over the fitting.

Like other types of piping, rodents can chew through PEX, which is particularly dangerous when they live in or near your home's plumbing system. Signs of rodent activity, including droppings, chewed paper and wood or shredded materials, can be an indication of a problem and should be addressed right away. Rodents typically want to get to the water inside homes, so it's important to protect your house's plumbing from them.pex water pipe