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Amazon.com: LoCo Science Stainless Steel Reducer Adapter for Vacuum Pipe Fittings - KF-25 to KF-40, Straight : Industrial & Scientific
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Amazon.com: Reducer Conical KF-40 to KF-50 Vacuum Fittings, ISO-KF Flange Size NW-40 to NW-50, 304 Stainless Steel, Flange Adapter : Industrial & Scientific
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Ideal Vacuum | Conflat Flange (CF) Reducing Nipple CONICAL, CF 2-3/4 inches to CF 2-1/8 inches, CF 2.750 inch to CF 2.125 inch, Stainless Steel, A2505400E0015101
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Ideal Vacuum | Conflat Flange (CF) Reducing Nipple CONICAL, CF 4-5/8 inches to CF 2-3/4 inches, CF 4.625 inch to CF 2.75 inch, Stainless Steel, A2505400E0030151
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ISO Conical Tri Clamp Reducer Adapter Vacuum Flanges Pipe Fitting Reducing Joint Connector Flange Adapter Stainless Steel 304 - AliExpress
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