Oil Filler, Short. Made in USA. These CNC machined oil fillers are machined from 6061 aluminum, anodized and laser etched for long lasting good looks. Includes rear breather port, and the good push-USA made o-rings. Tube diameter is 2" for easy filling. This unit replaces the alternator stand and prohibits the use of the factory alternator. Set you motor off with this great product!