Kovar to 7752 Domed Glass Adaptors are available from 1/2” to 6” OD. These can be without flanges or with standard vacuum style flanges. Custom combinations can be supplied.
Larson Electronic Glass offers "Closed End "Domed" Kovar-to-7052 Glass Adaptors" available in 10 standard sizes from 1/2 inch through 6 inch and are also offered in other non-standard sizes. Dimensions are in inches unless otherwise noted.