These plans are a step-by-step guide on how to build a cheap but quality water rocket launcher with a complete parts list. Steps are accompanied with pictures for clarification. This launcher will sustain launch after launch and will always be a favorite activity of your students. Launcher will enable you to propel a (PET) soda pop bottle over 250 ft. into the sky using only water and compressed air from a bicycle pump, a foot pump for a car, or an air compressor. The fuel (water and air) is essentially free and readily available allowing countless launches without additional expense. Launcher supports air pressures as low as 20 PSI up to 120 PSI. After pumping up the bottle to the PSI of your choice, you control when the launch occurs by pulling on the string to release the trigger from a safe distance and out of the splash zone. Launcher supports 1L, 1.5L and 2 liter plastic (PET) bottles. Great item for people of all ages for fun, science projects, school classes, parties, etc. and may well draw a crowd where it is used. Trigger mechanism slides up or down by loosening the hose clamp to accommodate variations in bottle construction. Made in the USA from durable non-corrosive Schedule 40 PVC pipe.