Uponor AquaPEX white is a PEX-a pipe designed for use in hot, cold, and hot-water recirculation potable-water distribution systems. The pipe has the highest chlorine resistance rating of 5 and offers one month of UV resistance. It can also be used in hydronic or radiant heating and cooling applications, however, because the pipe does not have an oxygen-diffusion barrier, it is only appropriate in systems that contain no ferrous corrodible components or where any ferrous components are isolated from the pipe. The PEX-a manufacturing method provides exceptional flexibility, strength, and durability, allowing a bend radius of 6X the pipe diameter to help eliminate unnecessary connections with each change in direction. Also, the pipe elasticity allows it to expand up to 3X its diameter and then shrink back down. This provides exceptional resiliency in freeze/thaw conditions. Note that no piping system is completely freeze proof, but PEX-a provides greater resiliency compared to rigid piping systems. Uponor PEX-a pipe is designed for use with Uponor ProPEX fittings, which require the use of a ProPEX expansion tool and ProPEX rings (sold separately). Material: Cross-Linked Polyethylene (PEX).