Turn off water supply leading to work area. Open faucet or flush toilet to remove water existing in line. Remove old connector. Slide flange over copper stub-out. Slide large compression nut and sleeve onto stub-out. Place the 3/8" O.D. compression nut and sleeve on supply tube. Position connector and tighten both compression nuts securely. Additional Details ------------------------------ Product description: Turn off water supply leading to work area. Open faucet or flush toilet to remove water existing in line. Remove old connector. Slide flange over copper stub-out. Slide large compression nut and sleeve onto stub-out. Place the 3/8" O.D. compression nut and sleeve on supply tube. Position connector and tighten both compression nuts securely.