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Connectors for round tubing
Metal Pipe Y-Connector - Niagara Machine, Inc Online Store.
PIPE DECOR 1/2 in. 6-Way Cross Double Outlet Black Iron Industrial Steel Gray 360 CRDO-12 - The Home Depot
Kee Klamp Type 10 Steel Pipe Fittings - Single Socket Tees | Hoover Fence Co.