Oatey 3/8 in. Threaded Rod Coupling 33550 - The Home Depot
Amazon.com: M6 Long Rod Nut Hex Coupling Nut Straight Fitting Hex Rod Threaded Bar Rod Studding Hex Zinc Plated 10pcs(M6 X18mm) : Industrial & Scientific
National Hardware N182-726 Threaded Rod Coupler 3/4 Inch 10 TPI Galvanized Steel: Threaded Rod & Coupling Outlet (886780007183-3)
M10 Threaded Rod Bar Stud Round Coupling Connector Nuts Silver Tone 15 Pcs - Walmart.com
CRE-Z1238 - Piers CRE-Z1238 - 1/2" x 3/8" Zinc Reducing Rod Coupling
Everbilt 1/2 in.-13 tpi Zinc Rod Coupling Nuts 822301 - The Home Depot
Fiberglass Unistrut, Threaded Rod Coupler Nut - 200-3842 (Options: 5/8"-11)
Superstrut 3/8 in. Threaded Rod Coupling - Gold Galvanized (Strut Fitting) (5-Pack) ZH119 3/8-5 - The Home Depot
Stainless Steel Threaded Couplings - Max-Gain Systems
Value Collection - Steel Threaded Rod Coupler for 3/8″ Conduit - 43579150 - MSC Industrial Supply
Value Collection - Steel Threaded Rod Coupler for 1/2″ Conduit - 43579143 - MSC Industrial Supply