SharkBite PEX tubing is cross-linked polyethylene tubing for a wide range of residential and commercial plumbing applications. PEX Pipe is durable, flexible and corrosion resistant. Manufactured without an oxygen barrier for potable water systems (available in white, blue, and red). A repeating SharkBite imprint patterns provides a visual aid to determine if the tube has been inserted all the way into the SharkBite push-to-connect fitting. This feature only works if the tubing is cut between the SharkBite imprint patterns. In addition to potable water supply SharkBite PEX meets UL standard for plastic piping in fire systems.