R-flex is a pre-insulated, flexible, energy-saving PEX piping system with a durable, waterproof outer cover. It provides cost-effective distribution for heating, cooling, and snow-melting applications at schools, universities, resorts, housing developments, and other residential facilities. R-flex consists of a long-lasting PEX carrier pipe or pipes surrounded by thick insulation layers, all contained in a unique double-wall outer casing.
—Watts Radiant