The RPI Midmark Limit Switch (#MIS255) fits the front panel controls and front box assembly. It is compatible with the following models: Midmark 75L/411 Exam Chair: -009 through -018 (All Serial #s). Ritter 222 Barrier-Free Power Examination Table: -001 through -017 (All Serial #s). Ritter 223 Barrier-Free Power Examination Table: -001 through -016 (All Serial #s). Ritter 230 Procedure Chair: -001 through -004 (All Serial #s). Midmark 622 Barrier-Free Examination Table: -001 through -008 (All Serial #s). Midmark 623 Barrier-Free Examination Table: -001 through -010 (All Serial #s). Midmark 630 Barrier-Free Universal Power Procedures Table: -001 through -009 (All Serial #s). Midmark 641 Procedure Chair: -002 through -005 (All Serial #s). Midmark 646 Podiatry Chair: -001 (All Serial #s). Midmark 647 Podiatry Chair: -001 through -004 (All Serial #s). Ritter Evolution 75 Procedure Chair: -009 (Serial #FA), -010 (Serial #FB), -011 (Serial #GT), -012 (Serial #GV), -013 (Serial #HY), -014 (Serial #HZ), -016 (Serial #JX), -017 (Serial #JY), -019 (Serial #V), -020 (Serial #V), and -021 (Serial #V). The RPI Midmark Hand Control Holster is equivalent to Midmark Parts #015-1055-00 and #62977400. Specifications RPI Midmark Limit Switch Specifications Toggle: Momentary (on - off). Power: 0.1 A @ 125 VAC, SPDT. Tabs: 3/16". Panel Cutout: 1.125" x 0.55".