Flexible, multipurpose* white polyethylene pipe that is food grade certified to NSF standard. Used for water filtration systems, reverse osmosis, ice machines, etc. Smooth inside to reduce sediment accumulation.
*For a refrigerator, it is best to use a braided stainless steel connector. New refrigerators release a lot of heat and are often installed in tight spaces of kitchen cabinets. The trapped heat affects the polyethylene pipe over time.