If conducting a large event that requires several launchers functioning together to get through a large field of participants in a short and safe period of time using a single air source (air compressor, bicycle pump, or scuba tank) and a single water source (garden hose or tank sprayer), then consider our STEM kit options. These systems can speed things up and the instructor gains full control of the pressurizing stage while all the students are a safe distance away from the rockets.