PEX is the most common type of plumbing pipe in homes. There are a number of reasons to choose it over copper, including its durability, cost efficiency, and resistance to corrosion that leaches toxic metals into household water supplies. However, PEX has its own challenges. For example, rodents seem to find it irresistible, and the pipes are prone to light damage. Also, the permeability of the plastic-based tubing makes it vulnerable to leaks. The good news is that you can take a few simple steps to prevent damage to your PEX water system.
PEX tubing is available in various lengths. It comes in three diameter sizes, 3/8″, 3/4″ and 1″. If you are replacing existing copper or galvanized steel pipe with PEX, try to match the size of the old tube for the quickest connection. For new installation, consider using push-fit connections. These fittings snap into place over the end of a PEX tube and are easy to remove with a special removal ring.
PEX is available in a variety of colors, such as red, blue and white. The color signifies whether it’s for hot or cold water lines. The letter designations don’t indicate quality, though — all three types have the same minimum pressure and temperature ratings, maximum bursting pressure, and ID/OD standards. The differences are in manufacturing methods and flexibility. PEX-A is the most flexible, making it more resistant to cracking in freezing temperatures. However, this extra flexibility can result in kinks that are difficult to work around with a heat gun. Type B is less flexible but still pliable enough to work with, and it offers the best balance between stiffness and flexibility. It’s also resistant to kinking that can render a pipe unusable. pex plumbing pipe