CTS (copper tube size) X FIPT (female iron pipe thread) compression connector for SDR-9 CTS polyethylene tubing. Brass fitting includes EPDM Rubber gasket, anti-friction ring, Mac-Pak nut with split clamp, and stainless steel screw. Insert stiffener is required in tubing end. Manufactured to include no more than 0.25% weighted average lead content on wetted surfaces.