80/20 Inc., 9705, 1.5" x 1.5" RT Square Tube with Flange x 72": Amazon.com: Industrial & Scientific
2 Inch Aluminum Flange | Aircraft Spruce
Kee Lite Type LC58 Aluminum Pipe Fittings - Swivel Flanges | Hoover Fence Co.
Aluminum Tubing - Square - .760" X .050" Wall x .125" Radius Corners x Adjacent Double Flange - Eagle Aluminum
Aluminum Flanges For Ducting | Aircraft Spruce
Extra Heavy Duty Aluminum Pipe Flange - 1.66 Inch Diameter (1 1/4 Inch Pipe)
Amazon.com: Structural Pipe Fitting, DIY Outdoor - 1-1/2" Adjustable Base Flange, 89A-8, Aluminum Magnesium, Note: ID of fitting is 1.925, to take nominal 1-1/2" steel pipe which all have an OD of
Amazon.com: Structural Fitting, 1-1/2" Round Base Flange, 31F-8, Aluminum Magnesium, Please note. ID of fitting is 1.925, to take nominal 1-1/2" steel pipe which all have an OD of 1.9". : Industrial