Kovar® to 7052 Glass to stainless steel bellows seals are available from 1/2” to 3” OD. These can be supplied without or with standard vacuum style flanges. Custom combinations can be supplied.
Larson Electronic Glass offers "Double Ended "Kovar-to-7052 Glass-to-Bellows" Adaptors" available in 7 standard sizes from 1/2 inch through 3 inch and are also offered in other non-standard sizes. Dimensions are in inches unless otherwise noted.