Soda Bottle Water Rocket Preassembled Launcher + StratoFins Kit Soda bottle water rocket launcher 95% preassembled + StratoFins, screw-on water rocket fins. Launcher will enable you to propel a 2 liter plastic (PET) soda pop bottle over 350 ft in the sky. Supports most .5L, 1L, 1.25L & 2 liter soda bottles @ air pressures as low as 20 PSI up to 120 PSI Fins require no tools or glue for assembly, simply screw-on to a 2 liter soda bottle or smaller. Water rocket (2 liter soda bottle), parachute, and nose cone are NOT included in this kit.