The present invention relates to a selector, and more particularly, to a selector that may interrupt or regulates flows of a fluid, and selectively discharge a preset quantity of the introduced fluid. Because the fluid introduced may be accurately discharged at a predetermined flow rate according to the set inner diameters of the tubes through a simple manipulation, the selector may be conveniently used and an accurate flow rate may be consistently adjusted, and the selector may be conveniently manufactured without using an adhesive.
