Marquardt insulation seal and mounting frames for rocker switches series 3250 marquardt 217878011 a stacking mounting frame adaptor for rocker switches of the 3250 series from marquardt this adaptor will mate with other adaptors on both sides this allows switches which normally require a 211 x 368mm cut out to fit into a 22 x 384mm cut out marquardt 217878011 middle panel adaptor for rocker switches series 3250 black