Abstract: A dispenser (1) for connection to the sequencer breech plate (5) of a dispensing system on an aircraft having a plurality of firing contacts, comprises a main body (2) subdivided into a plurality of cells (6). The number of cells (6) in the main body (2) is greater than the firing contacts on the breech plate (5) by payloads (7) being received directly by the main body as opposed to being separately constrained. An interface plate (4) is provided for electronically and mechanically connecting the dispenser (1) to the breech plate (5) matching the firing contacts to the breech plate with firing positions corresponding to the plurality of cells of the main body. In order to provide the electrical matching, pairs of contacts on a first part (12) of the interface plate (4) are interconnected by selector means (18) allowing a first firing signal to pass only to one contact of the pair and then allowing a second signal to pass to the other contact.