This is a threadless pop-up gas cap, so it protects your paint. It will screw into stock Harley filler bung and is not vented. This gas cap is designed to be a sealed cap using an external tank vent. - See more at: http://www.dirtybirdconcepts.com/shop/item.aspx/pop-up-gas-cap/50/#sthash.JiQWg2Pk.dpuf