Liquid dispenser

Claim 1

A PROTECTIVE OVERCAP FOR A DISPENSING PUMP PLUNGER, SAID OVERCAP BEING OF INVERTED CUP SHAPE DEFINING A SOCKET CLOSED AT ITS UPPER END AND OPEN AT ITS LOWER END FOR RECEPTION OF THE PLUNGER, AXIALLY EXTENDING RADIALLY INWARDLY PROJECTING LANDS WITHIN SAID SOCKET, SAID LANDS BEING RELATIVELY UNIFORMLY ANGULARLY SPACED AND DEFINING A PLURALITY OF AXIALLY EXTENDING GROOVES BETWEEN ADJOINING LANDS, THE BOTTOM AND SIDE WALLS OF SAID GROOVES BEING DISPOSED AT THE CORNERS OF A FIRST REGULAR POLYGON ON A COMMON SURFACE OF REVOLUTION, SAID LANDS HAVING INWARDLY DIRECTED FLAT SURFACES SUBSTANTIALLY COINCIDING WITH THE RESPECTIVE SIDES OF A SECOND REGULAR POLYGON, THE ANGLE BETWEEN THE FLAT SURFACES OF ADJOINING SAID LANDS BEING EQUAL TO A MULTIPLE OF ANGLE BETWEEN SAID SIDEWALLS OF EACH SAID GROOVE, SAID SURFACE OF REVOLUTION BEING OF GREATER DIAMETER THAN A CIRCLE CIRCUMSCRIBED ABOUT SAID SECOND REGULAR POLYGON.