SharkBite oxygen barrier PEX is a cross-linked polyethylene tubing designed for use in radiant or hydronic heating applications. Oxygen barrier PEX has an oxygen barrier applied to the exterior of the pipe, which limits oxygen permeation through the tubing wall in hydronic heating applications preventing corrosion of metal parts in the heating system. PEX pipe is flexible and easy to work with, which reduces the number of fittings needed to complete a job; reducing cost and leak points. PEX is also extremely durable and corrosion/freeze resistant. SharkBite PEX is compatible with brass or plastic barb fittings using copper crimp ring or stainless steel clamp connection methods or push-to-connect fittings.