Here is a fun kit that lets you build a metal water rocket launcher. The StratoLauncher IV Water Rocket Launcher has aluminum, plastic, and brass parts. You can use a 2gal tank for up to 30 launches. The StratoLauncher launches bottles over 350ft in the sky.
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You can upgrade the kit to do more with it. Its 125 PSI safety valve prevents exploding water bottles.
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