Bottom flange is 26 across. (2) 8 non-rotatable conflat flanges. Non-rotatable conflat flange (on top). The item "MDC Stainless UHV Research Vacuum Chamber 24 Diameter 20 tall Conflat 8 CFF" is in sale since Wednesday, November 18, 2020. This item is in the category "Business & Industrial\Hydraulics, Pneumatics, Pumps & Plumbing\Pumps & Pump Accessories\Vacuum Pumps\Other Vacuum Pumps".The seller is "zoro" and is located in Saint Paul, Minnesota. This item can be shipped worldwide.