Abstract: An agricultural work machine includes a frame and a tank coupled to the frame for storing a product. The tank includes a nozzle portion. A row unit is coupled to the frame and includes a hopper and a meter assembly. A product distribution line is coupled between the nozzle portion of the tank and the hopper. A blower is controlled to provide an air flow through the distribution line to transfer product from the tank to the row unit, and a mechanism located in the tank above the nozzle portion is controllable between an open position and a closed position. In the open position, the product in the tank flows through the mechanism into the nozzle portion, and in the closed position, the mechanism blocks the product in the tank from flowing into the nozzle portion.