3 1/2-inch-diameter PVC end cap, qty. 1. Container each, PVC primer and cement, qty. 1. Can spray paint, qty. 1. 2 Step 1. Media Platforms Design Team.

The electrodes are made from PVC end caps, sanded down flat at the tip. A hole is then drilled through the cap to accommodate a small machine screw.

4-inch PVC end cap. 4-inch PVC fitting adapter. 4-inch PVC coupling pipe. 4-inch x 24-inch PVC pipe. This is the combustion chamber. 4-inch to 2-inch PVC reducer. 2-inch x 48-inch PVC pipe.