The invention provides a kit comprising a medical accessory device and a dummy unit. The accessory device comprises first attachment means configured for releasable attachment of the accessory to co-operating second attachment means on an original device having an outer surface defining an original device space envelope. The dummy unit comprises a presentation surface on its external surface, a folded or rolled sheet, as well as dummy attachment means configured for releasable attachment of the accessory device to the dummy unit in co-operation with the first attachment means. By this arrangement the mounting of the accessory device on the original device can be demonstrated on the dummy unit in a simple and effective way.
