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Amazon.com: Structural Pipe Fitting, 1-1/2" Heavy Duty Square Base Flange, 34F-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
Amazon.com: Base Flange, Nominal Pipe Size 1 1/4 In : Industrial & Scientific
TC132 - Standard Railing Base Flange Galvanised Pipe Fitting