UHV research Vacuum Chamber Bell Jar with In-built Ion Pumps. The diameter inside is about 12. It has one 8 inch port, one 16.5 inch port and ten 2.5 inch ports as well as a 1.33 inch port for the ion pumps.All the knife edges are in perfect condition. We also have a lot of flanges available for this chamber which we can throw in for a little extra if interested. Let me know if you have any further questions! The item "UHV Vacuum Chamber Bell Jar with In-built Ion Pumps" is in sale since Wednesday, October 13, 2021. This item is in the category "Business & Industrial\Hydraulics, Pneumatics, Pumps & Plumbing\Pumps & Pump Accessories\Vacuum Pumps\Vacuum Chambers". The seller is "isatho55" and is located in Springfield, Missouri. This item can't be shipped, the buyer must pick up the item.