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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
USA Industrials - Aluminum Pipe Fittings; Material Grade: Class 150 - 28851988 - MSC Industrial Supply