An on-off controller, according to various aspects of the present invention, for controlling a flow of fluid from a provided bottle, wherein the bottle has a poppet valve biased in a closed position, wherein fluid flows from the bottle when the poppet valve is open. The on-off controller includes a body, a bore, an activator, and a position mechanism. The body includes an axis and an inlet. The inlet is positioned axially and couples to the bottle. The bore is formed through the body. Each end portion of the bore is open at the exterior of the body and the bore is not parallel to the axis. The activator includes a depressor that opens the poppet valve, a position connector, and at least one pin disposed between the depressor and the position connector. The activator does not obstruct the bore. The position mechanism moves the activator.