ZurnPEX® QickClamp™ Crimp Rings. Stainless Steel (Type 304) mechanical fastener used to secure ZurnPEX® tubing to Zurn Qick/Sert1® and QickSert CR™ fittings. Integral locating flange and sight hole. The 1/2" QickClamp® stainless steel Crimp Ring utilizes a patented mechanical fastener that requires only one tool for 3/8", 1/2", and 3/4", speeding and easing installation. The gripping ribs assure ring stays in position after being pushed onto the tube for easy installation and proper alignment of ring, tubing, and fitting.