Water balloon fight, who's in? The perfect set for a water balloon fight. Filling and tying water balloons couldn't be more simple. The fool is attached to the pump to assist in the tying of the ballooons. Kids can do it themselves! Easy, easy operation: First, fill the container with water Next, attach a balloon to the nozzle Press the pump to fill the balloon with water. Wrap the filled balloon around the Tie-Not tool, slip the end through the notch Ta-Da! pull off a perfectly tied balloon.