Ideal Vacuum | Conflat Flange (CF) 1-1/3 inch to Swagelok 3/8 inch, Stainless Steel Tube Fittings
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
DFZ Flanges ANSI B16.5 Ferrule Tube Fittings On DK-LOK USA
Custom Pipe Flange Fittings | UNITED STATES FITTINGS™