As you probably saw on the show, my first exhaust system failed. Below are the details on the simplified set up. It consists of two PVC joints and a rubber grommet. Using a rotary tool, cut a hole at the back of the larger PVC joint just big enough to fit one end of the smaller PVC joint into. Epoxy the two joints together to create your sweet exhaust system. Lastly epoxy the rubber grommet to the other end of your small joint. This should fit snuggly on your fire extinguisher. nozzle. You may have to trim it with your rotary tool to fit whatever brand of fire extinguisher. you buy.