It’s dark and I’m racing at our night of fire race so I hope this picture doesn’t go sideways like mine always seem to do on my phone. All it is a piece of black rubber hose going to the back of my carb, tapped carb spacer, or intake manifold. I can open it to lean out the engine to help build heat and save fuel. Nothing fancy and works lol me a charm. I like Brad Penn oil with alcohol and change oil 2-3 times a year and it comes out looking great. Run your car rich and you will have issues and won’t build heat polluting the oil.