Aluminum Fuel Cell Bulkhead Fitting AN6 AN8 AN10 Accessories Black Fuel Cell Bulkhead Adapter Fitting Application: For Universal Specification: 100% quality assurance tested, more responsive, less expensive, easier to install. Anodized for great appearance,anti-corrosion durability, long last and strength. Designed for leak proof sealing with any manufacturers adaptor fittings. Completely reusable. Precision-machined to exact tolerances for trouble-free performance. Material Color: Material: made of high qualityAluminum. Color: as picture. Package Included: 1/2/5pcs x Aluminum Fuel Cell Bulkhead Fitting (100% Brand New Never Used Or Installed) About Block Off Nut: The AN thread is a particular type of fitting used to connect flexible hoses and rigid metal tubing that carry fluid. It became popular for usage within Professional racing for the ability to easily customize new lines. From there it s usage spread to the aftermarket automotive performance field for its ease in adaptability, upgradability and durability. Note: Provide Tracking Number With Every Order, Please Buy With Confidence! No installation guides are included, we highly recommend to seek professional installation. Any damage during installation will not be refunded. Will come with everything you see in the picture. Please allow difference due to manual measurement. Please check that the picture matches before purchase. The color of the actual items may slightly different from the listing images due to different computer screen, thanks for your understanding. For any inquiries or special requests such as larger amount ordering please write to us.