Larson Electronic Glass offers in addition to glass to metal adaptors a collection of standard fractional sized flexible couplings mounted on standard vacuum flange types including CF, ISO Kwik-Flange® and Large-Flange® from 3/4” thru 6”.
Larson Electronic Glass offers "Stainless Steel Flexible Couplings" available in 8 standard sizes from 3/4 inch through 6 inch. Bellows are type 321 stainless steel. Flanges are type 304 stainless steel. Dimensions are in inches unless otherwise noted.