Watts 1" F.I.P (Female iron pipe) x 3/4" F.I.P (Female iron pipe) x 18" long corrugated stainless steel water softener connector. Features: Allows easy hook up to 1" M.I.P. (Male iron pipe) thread on water softener head. Corrugated stainless steel allows ease of installation to water supply line coming off the water softener to 3/4" copper, PEX, CPVC, or PVC pipe. Manufactured to include no more than 0.25% weighted average lead content on wetted surfaces.