This Oxy-Propane Potato gun is on Steroids. Not only do you get a much more explosive mixture with straight Oxygen than air, but, because of the pressurized delivery, you can force more fuel into the chamber. And, you don't have to steal your wife's hair spray. It is made of all steel instead of PVC for safety, and to give it that bad-ass look :) My wife thought I was going outside to battle aliens. Complete build steps included in video.