Uponor is the first company to offer a pre-insulated crosslinked polyethylene (PEX) tubing. The core of this product is AquaPEX: a flexible, durable, corrosion-resistant product with a 20-year proven history, and a 25-year limited warranty. A half-inch layer of foam helps potable water lines meet energy code requirements. Pre-insulated AquaPEX features the same tight bend radius as AquaPEX, and because the insulation is already on the tubing, it eliminates the hassle of insulating in tight, confined spaces. It also reduces waste and hot water delivery wait times.