1/2 inch NPT Female Nut Threaded Insert Weldable Aluminum Alloy Pipe Fittings for Car - Walmart.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". :
Aluminum, 1/2 in x 1/4 in Fitting Pipe Size, Hex Bushing - 60PW02|ZUSA-PF-9395 - Grainger
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 - 28850840 - MSC Industrial Supply