Dispenser container for viscous fluids

A dispensing container intended for single use prepared by pressure diecasting, which comprises a container body provided at one end with a resiliently compressible portion including a mouthpiece;

• a storage chamber to hold material to be dispensed;
• a piston member arranged at the other end of said container to define a boundary of the storage chamber, the piston member being movable towards and restrained from movement away from said compressible portion;
• a top surface to define another boundary of the storage chamber;
• and an elastically compressible pump means defined by said compressible portion and by said top surface and having an inlet valve in the top surface, an outlet valve, and a pump chamber between the valves, said inlet valve comprising (1) an annular slot extending circularly in the top surface symmetrically to the longitudinal axis of the container and having a cross-section extending at an angle of from about 45.degree. to 75.degree. from the direction normal to the container axis and (2) a circular cover ring held sealingly in front of the annular slot and elastically under constant stress, the cover ring being held by three or more spokes radiating from a hub positioned in the center of the top surface.