These plastic flange protector caps fit 1 1/3, 2 1/8, 2 3/4, or 3 3/8 inch CF flanges and are used to protect the flange face.
Resources
Literature
Series 88 CF UHV Components & Fittings(399.8 kB, PDF)
These plastic flange protector caps fit 1 1/3, 2 1/8, 2 3/4, or 3 3/8 inch CF flanges and are used to protect the flange face.