Abstract: A pump assembly includes: a cylinder open on top and bottom thereof and having a hollow portion formed therein and a first wing protruding outward from the outer peripheral surface of top thereof; a sealing part having at least a portion thereof inserted into the cylinder to at least partly seal the upper peripheral surface of the cylinder and a second wing protruding outward from the outer peripheral surface of the top thereof; a stem moving downward by means of an external force to vary internal pressure of the cylinder; an elastic member disposed between the stem and the sealing part to apply an elastic force to the stem from the sealing part; and a housing coupled to the cylinder in such a way to surround the outer peripheral surface of the upper portion of the cylinder and adapted to detachably couple the pump assembly to a container.

Abstract: An elastic member for a pump assembly is provided. The elastic member may include an upper support; a lower support provided under the upper support; and a connection part which connects the upper support and the lower support, and in which peaks and valleys are repeatedly formed in an outward direction to be bent when the elastic member is pressurized.

Abstract: An elastic member for a pump assembly is provided. The pump assembly may include an elastic member having an upper support, a lower support provided under the upper support, and a connection part which connects the upper support and the lower support, and in which peaks and valleys are repeatedly formed in an outward direction to be bent when the elastic member is pressurized.

Abstract: An elastic member for a pump assembly is provided. The elastic member may include an upper support; a lower support provided under the upper support; and a connection part which connects the upper support and the lower support, and in which peaks and valleys are repeatedly formed in an outward direction to be bent when the elastic member is pressurized.