Barnacle Busters50685 Swirl-Off Barnacle Buster Inner Retaining CupSKU: 50685 The Swirl-Off Inner Retaining Cup is used to hold the axles in place on the barnacle busters. Interested in this product? Add to quote Related products Barnacle BustersStanley Infrastructure GR29310 Underwater Hydraulic Grinder Accessories50810 Swirl-Off 6″ Barnacle Buster w/ Knockers View product Barnacle Busters50686 Swirl-Off Nut For Barnacle Busters View product Barnacle Busters50683 Swirl-Off Spacers (Set of 42) View product