Image KF Centering Ring Vacuum Fitting Assembly Product Options Part Number Flange Size Material DVF-A10GE KF10, KF16 304 Stainless steel with FKM O-ring DVF-A16GE KF16 304 Stainless steel with FKM O-ring DVF-A25GE KF25 304 Stainless steel with FKM O-ring DVF-A40GE KF40 304 Stainless steel with FKM O-ring DVF-A50GE KF50 304 Stainless steel with FKM O-ring