Abstract: A system includes a liquid bottle, a tank, and a hole. The liquid bottle has a connection port. The liquid bottle is configured to store recording liquid. The tank has a connection receiving port configured to be connected to the connection port. The tank is configured to store the recording liquid. The hole surrounds the connection receiving port. In the system, the liquid bottle has a protrusion having the connection port. The protrusion is configured to be inserted in the hole. A shape of an outer peripheral surface of the protrusion in an axial direction in which a center axis of the protrusion extends corresponds to a shape of the hole. The shape of the outer peripheral surface of the protrusion in the axial direction is not rotationally symmetrical about a center of the protrusion.