a tank sprayer includes a tank having an opening and a cup configured to move between a first position and a second position . the cup is configured to retain a quantity of liquid when the cup is in the first position and is configured to pour the quantity of liquid into the tank when the cup is in the second position . a removable barrier covers the opening in the tank , wherein the cup is blocked from moving from the first position to the second position when the barrier covers the opening in the tank . the cup is allowed to move from the first position to the second position when the barrier does not cover the opening in the tank .