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1. A nozzle unit for a reaction moulding machine, the nozzle unit comprising, a mixing head outlet; a first dispensing nozzle; a second dispensing nozzle located adjacent to and independent of the first dispensing nozzle; an inlet channel connected to a-the mixing head outlet, the mixing head outlet configured to apply a reactive mixture via a selected one of the first and second dispensing nozzles, and a valve arrangement comprising a piston, the valve arrangement configured to switch between a first operating state and a second operating state, wherein in the first operating state, the first dispensing nozzle is connected to the inlet channel to apply the reactive mixture while the second dispensing nozzle is disconnected, wherein in the second operating state, the second dispensing nozzle is connected to the inlet channel to apply the reactive mixture while the first dispensing nozzle is disconnected, wherein the piston is configured as a sliding piston that is guided displaceably in a housing of the nozzle unit, the piston having a first through-bore and a second through-bore that are arranged spaced apart and separate from one another along an axial direction of a longitudinal axis of the piston, the piston being configured to switch from a first valve position to a second valve position, wherein when the valve arrangement is in the first operating state, the piston is in the first valve position so that the piston connects the inlet channel to the first dispensing nozzle via the first through-bore and disconnects the second nozzle, and wherein when the valve arrangement is in the second operating state, the piston is in the second valve position so that the piston connects the inlet channel to the second dispensing nozzle via the second through-bore and disconnects the first nozzle, wherein the piston translates horizontally with respect to a vertical longitudinal axis of the mixing head outlet.
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