This aluminum gas cap gives your motorcycle gas tank a clean custom look when installed. Being aluminum it is also paintable, so it can be painted to match the gas tank, further blending in. To remove the gas cap, simply push the cap and turn slightly and it pops up. The knurled edge allows it to easily be unscrewed. The gas cap measures 2" in diameter. It is completely flush when tightened down. The included filler bung is mild steel for easy welding into gas tanks for any custom applications. This cap is vented.