Sharkbite pex tubing is a cross-linked polyethylene tubing for a wide range of residential and commercial plumbing applications. Manufactured without an oxygen barrier for potable water systems and with an oxygen barrier for radiant floor and hydronic heating applications. The oxygen diffusion barrier applied to the exterior limits oxygen permeation through the tubing wall in hydronic heating applications which prevents corrosion of ferrous metal parts in the heating system. A repeating sharkbite imprint pattern provides a visual aid to determine if the tube has been inserted all the way into the sharkbite push-fit fitting. This feature only works if the tubing is cut between the sharkbite imprint pattern. 1" copper tube size x 100' Blue Pex coil A cross linked polyethylene tubing used for potable water application. Use for potable water distribution and other water systems. Printed with a sharkbite imprint pattern that provides a visual aid to determine if the tube has been inserted all the way into the sharkbite push fit fitting. Certified to the following standards: ASTM F876, ASTM F877, CSA B137.5 and AWWA C904.