A dispenser has a container and a spreading spring which is in engagement with the inner wall of the container and prevents movement of the sealing piston in a second direction which is opposed to the first direction. The spreading spring is made from synthetic material and has a central part from which a plurality of fingers arranged distributed over the periphery extend radially outwards. Each finger is connected to the central part in a manner articulated at its radially inner end and is in engagement at its radially outer end with the inner wall of the container. The central part and the fingers are constructed in one piece with one another and each finger is connected to the central part by way of a web, wherein in the region of the web a cutout is formed.