Team Z Motorsports offers a Weld-On Filler Cap for your fabrication needs. Whether you are building your own housing, or making a set of ballast bars, we have you covered. The filler neck and cap are made in house on our CNC Lathe to ensure a high quality and affordability. The filler necks are turned from 8620 steel and the caps from 6061 aluminum with an incorparated O-ring to provide strength and a great appearance. Proudly made in Detroit, Michigan.