STEM Kit Fire Truck 4 fantastic models to perform heroic deeds and save entire cities. The construction set includes an adapter for a conventional PET bottle, which is installed in the model to be used as a water tank. This teaches children the importance of sustainability and the fact that everyday objects can have many other uses. An air pump is used to pressurize the PET bottle filled with water. When the valve is opened, water is sprayed through the connected fire hose. An educational and fun way for children to learn about the relationship between air and water pressure. Together with the included fischertechNik little man, children experience many exciting adventures: heroic missions are experienced, fires are extinguished and people are saved. Assembly instructions for building 4 fire truck models. Contains 322 parts to assemble including pneumatic cylinder with check valve, manual valve, pneumatic hose, PET bottle adapter, water sprayers, vehicle with steering. Recommended age: +7 years. Made of plastic. According to EN71&ASTM regulations. WARNING: Not recommended for children under 3 years, contains small parts. Adult supervision is recommended during play. Read the instructions before use, follow them and keep them for reference. Made in Germany by Fischertechnik.