Abstract: The invention relates to a dispenser closure formed of elastomeric material which is suitable for fitting to the discharge spout of a liquid container formed of a flexible film material such as polyethylene film and housed in a cardboard casing. The closure is provided with sealing means, the effectiveness of which is increased with increasing pressure within the container, and a diaphragm like transverse wall positioned across the discharge spout, said transverse wall being provided with an outwardly directed protrusion which is manipulated with a toggle like action to distort the transverse wall and sealing means to permit liquid to flow from the container.