Water Rocket (Bottle Rocket) Adapter

This fun little thing allows you to attach a standard 1/4 NPT air hose quick disconnect to a 2 Liter Bottle. This allows one to print out a very easy way to pressurize and launch soda (or pop) bottles of various sizes. Based on my research they have a standardized cap size, except for water bottles which seem non-standard. (The pictured bottle is obviously not a 2 L, but the threads are identical)

The quick disconnect becomes your nozzle, an easy way to apply gas and also a simple way to rele