Luer Lok Adapters with locking hubs are used for attaching Dispensing Tips to static mixers. For part numbers, please consult factory. If you want to use a metal jacket with the 3/16”ID or 1/4"ID bell mixers, order the mixer and the Luer Lok fitting as two separate items unassembled (need to order the square hub outlet and (7700943) Luer Lok fitting).