Marquardt insulation seal and mounting frames for rocker switches series 3250 marquardt 217879011 a mounting frame for rocker switches of the 3250 series from marquardt allows switches which normally require a 211 x 368mm cut out to fit into a 22 x 384mm cut out this is a stand alone adaptor for a single switch stacking adaptors 217878011 59 3917 are also available and these can be mated side by side can be used with 3431710211 59 3914 waterproof seal to achieve ip67 protecti