Cross-linked polyethylene, or PEX, tubing, is widely used in industrial and home plumbing as a replacement for copper tubing. While steel pipes used to be the standard, copper tubing became the norm in the 1960s. With the development of plastics, however, PEX quickly became a reliable, inexpensive, safe tubing to be used in all types of plumbing systems. PEX’s ability to carry pressurized water to fixtures throughout buildings and homes have made it a reliable standard ever since. Confirm the size and length of PEX tubing you want before you shop. For fixtures and more, browse Zoro’s selection of toilets, sinks, faucets and plumbing supplies.