The best material for your refrigerator water line is braided stainless steel, however, that can cost a lot of money. Between plastic and copper, it really depends on preference. Copper is strong but it corrodes and gets kinked. Plastic is a good choice, but its not nearly as strong as copper.
What is refrigerator water line made of?
While water supply lines to refrigerators can be made of different materials like copper, plastic types and braided stainless steel, the good news is with adapters, most ice-maker supply lines should be able to connect to most refrigerators.
What kind of pipe do you use for buried water lines?
Cross-linked polyethylene, or PEX, is a plastic water supply line suitable for both buried and above ground applications. Like a thick, strong hose, PEX is a flexible tubing material capable of stretching around bends and turns without pipe fittings. PEX withstands chemical damage, high temperature and high pressure.