A filling head apparatus for producing frozen confectionery products. The filling head 1 comprises a tubular housing 3 which surrounds and is coaxial with a piston 10, the tubular housing 3 comprising first and second chambers. The piston 10 is longitudinally movable within the housing between a closed position and an open position such that when the piston is in the closed position it closes an outlet of the first chamber and when the piston is in the open position the entry openings in the piston communicate with the second chamber.
