A flow control device is provided. The flow control device includes a body including a containing space, a discharge opening fluidly communicating with the containing space, and a pair of side holes configured to be in radial correspondence with each other; a flow control member installed in the containing space and including a pair of engaging portions corresponding to the side holes; an adapter including an adapting part coupled to the body and a hitching part for being coupled to an external container; a washer coupled to the adapting part and inserted into the body for installing the flow control member in the containing space; and a handle including an operational part, and a pair of engaging ends coupled to the operational part and engaged with the engaging portions through the side holes.