Suitable for demonstration experiments on recoil movement in school physics teaching Main components Adjusting nails, upper and lower supports, water containers, nozzles, bases, beams, columns, sealing seats, supporting seats, and other related parts. How to set up Take out the water container with the mouth facing upward. Install the water container on the bracket. Adjust the adjusting screw so that the water container can rotate flexibly. How to operate Pour water into the water container to close to the upper mouth. Place the instrument in the sink. Key benefits Clear visualization of recoil movement in a teaching context, helping students grasp the concept. Rotational adjustability of the water container enables flexible demonstrations from different angles. Built from common lab components (adjusting nails, supports, bases, beams, columns, etc.), supporting straightforward maintenance and assembly. Simple, waterbased setup that is easy to prepare and use in regular classroom environments. Practical use scenarios Inclass demonstration of recoil when water is expelled through the nozzle, illustrating the basic physics concept in a tangible way. Studentled experiments varying the rotation angle and nozzle configuration to observe changes in recoil behavior. Curriculumaligned demonstrations in school physics labs to reinforce lessons on motion, forces, and interactives between components in a mechanical setup. Notes on specifications Designed for use with standard school physics lab components and configurations as listed (adjusting nails, upper and lower supports, water containers, nozzles, bases, beams, columns, sealing seats, supporting seats). Size and material details are not specified; the description focuses on function, compatibility with typical classroom equipment, and practical operation.