$65.99 AQUA-DYNAMIC Pex Crimp Ring 1/2 in. 9284-803 | Réno-Dépôt
Everflow EPCR0012 1/2 Inch PEX Crimp Rings, Copper Crimp Rings, Go/No-Go Gaug 804595976296 | eBay
Buy Holdware 100pcs 1/2 inch PEX Cinch Clamps, Stainless Steel PEX Crimp Rings 17.5mm Diameter 
