Description Inserts into threaded fitting socket to reduce to smaller threaded opening. Teflon thread tape is recommended for threaded joints. Conforms to ASTM D2466. 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