Description For water heater inlet and outlet hook-ups and other uses where dissimilar metals occur in piping and plumbing systems. Thermoplastic lining prevents corrosion. 2-1/2" length. WARNING: This product can expose you to chemicals including Lead which is known to the State of California to cause cancer, birth defects or reproductive harm and Butyl Benzyl phthalate (BBP) which is known to the State of California to cause birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov