SteelTek 1-1/4-in Structural Galvanized Single Socket Tee in the Structural Pipe & Fittings department at Lowes.com
10 Sets 1 Inch 90 Degree Structural Pipe Connector 3 Way Metal Joint Chain Link Fence Clamp, Stainless Steel 201 Corner Fitting End Rails Clamps, Thickness 1.8mm - Amazon.com
SteelTek 1-1/4-in Structural Galvanized Coupling in the Structural Pipe & Fittings department at Lowes.com
Amazon.com: Structural Pipe Fitting, DIY Outdoor, Use Imagination -1-1/2"Tee-E Short, 3T-8, Aluminum Magnesium, Note: ID of fitting is 1.925, to take nominal 1-1/2" steel pipe which all have an OD of 1.9". :