ZURN PEX™ annealed copper crimp ring. Used to secure ZURN PEX™ tubing to Zurn® Qick/Sert® and QickSert CR® fittings. The 1 in annealed Copper Crimp Ring is used to secure ZURN PEX™ tubing to XL Brass and Qick Sert CR® fittings, and are certified for hot and cold water plumbing applications. For use with SDR9 tubing, and is designed for longevity and durability.