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
Fittings to Design Your Own Frame (Pipe Connectors) - Carl's Place
HOLLAENDER Structural Pipe Fitting: Cross, 2 in For Pipe Size, | Fittings for Slide-On Railings & Framing Systems | The BuildClub - Buildclub