https://www.ultrahighvacuum.com/shop/ka1540-cf150-to-kf40-tubulated-adaptor-17153
CF150 to KF40 Tubulated Adaptor | ultrahighvacuum
CF to KF Tubulated reducing adaptors are used to change from a CF flange to a KF mating flange enabling the fitting together of mismatched components....
adaptor