The invention relates to a dispensing device for flowable products, the dispensing device comprising: at least a first and second plugs adapted to allow or prevent the flow of product; a first guide block comprising a guide hole adapted to guide the first plug, and a channel in communication with the guide hole, that allows the passage of maintenance fluid; a second guide block isolated from the first guide block, the second guide block comprising a guide hole able to guide the second plug, and a channel for passage of maintenance fluid, and a coupling adapted to connect in a fluidtight manner the channel of the first guide block to the channel of the second guide block, in order to allow the passage of maintenance fluid.