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I am a teacher that loves engaging students in fun learning activities. What started out as a creative end-of-year project turned into a fun side business for my family. Water rockets are nothing new but the design of the launcher is extremely important for successful flights. The launchers I sell have gone through many tests including the following: Pressure tests, angle tests, spliced-bottle rocket tests, and most importantly, repeated launches tests. These launchers a heavy duty but lightweight and will withstand hundreds of launchers without breaking. Other launchers have o-rings and other specials seals but these launchers seal perfectly without any of that. I enjoy creating fun things and when I develop something worthwhile I share it with others by selling on ebid (and sometimes ebay). Thanks for checking out my listings.