Need an idea for a cool science fair or class project? Interested in starting a new hobby that is cheap? Water rocketry is a great activity for everyone to get involved in. The launchers can be hard to build or of poor quality but I have tweaked such a launcher to cost effective as well as very durable to withstand several launches and at fairly high pressures (130 psi). I've been selling them for quite some time on ebay but the fees are too much! Take a look at my listing descriptions and videos if you're interested. I promise you won't be disappointed! Let me know if you have any questions.