A nozzle apparatus for an agricultural crop sprayer, the apparatus having a control element adjustable using ah external power source for controlling the flow of a spray liquid from a spray line through at least one channel of the nozzle apparatus. Once the control element has been moved to a control position, the position is maintained without further need for external power. The control element may be a ball valve movable to simultaneously select two or more nozzle connections and also to vary flow through the selected nozzle connections.