SteelTek 1-1/4-in Structural Galvanized Coupling in the Structural Pipe & Fittings department at Lowes.com
Kee Klamp Type 20 Steel Pipe Fittings - Side Outlet Elbows | Hoover Fence Co.
3/4" 4-Way Side Outlet Tee, Home TZH Malleable iron Pipe Fittings for Industrial vintage style, Flanges with Threaded Hole for DIY Project/Furniture/Shelving Decoration (10, 3/4") - Amazon.com
Amazon.com: SuperWhole 3/4"Thread 4 Way Female Cross Coupling Connector SS NEW 304 Pipe Fitting NPT : Industrial & Scientific