The Plumber's Choice 3/4 in. Hinged Split Ring Pipe Hanger, Copper Epoxy Coated Clamp with 3/8 in. Rod Fitting, for Hanging Tubing (10-Pack) 34HSHCP-10 - The Home Depot
Oatey 1-1/4-in to 1-1/4-in dia Galvanized Split Ring Hanger in the Pipe Support & Clamps department at Lowes.com