Vibrant Performance 8 AN Female Straight Union Adapter Fitting Vibrant Performance 8 AN Male Straight Union Adapter Fitting Aluminum EVIL ENERGY AN Female to AN Male Flare Fitting Y Block Union Splitter EVIL ENERGY AN Female to AN Male Flare Fitting Y Block Union Splitter Vibrant Bulkhead Fuel Cell Adapter Fittings. Vibrant Performance fuel cell bulkhead adapter fittings are lightweight and constructed from 6061 aluminum. Vibrant Performance fuel cell bulkhead adapter fittings connect your fuel line to your fuel cell or tank. Our fuel cell bulkhead adapter fittings are double anodized, hand polished, wont restrict fuel flow and come complete with two PTFE washers.