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Go to the shopStart your own space mission with just some water, a bottle and a bicycle pump! Great fun to play and educational too. The water rokit is great fun to play but is also a great educational tool as it perfectly illustrates sir isaac newtons third law of motion. To make the water rokit fly simply put tap water into a bottle screw in the special bung device with the rocket fins attached and use the yellow pipe and a bicycle pump to pump up the bottle. The rokit works best on a flat surface.