This item is spare part for the these David Clark Items: H3310, H3320, H5010, H5020, H6020, H6220-M, H6620i, H6720-M, H7010, H7020, H9910, 12506G-06, 12506G-07, 12512G-05, 12512G-06, 12512G-09, 12514G-06, 12514G-07, 12518G-03, 12518G-07, 12518G-08, 12520G-20, 12521G-07, 40762G-01, 40762G-02, 40762G-03, 40762G-04, 40825G-01, 41031G-02, 41042G-01, 41086G-01