Vibrant 4AN Flare Tee Adapter Fitting Aluminum (10481) MAPerformance EVIL ENERGY AN Female to AN Male Flare Fitting Y Block Union Splitter Vibrant 12AN x 12AN x 12AN Y Adapter Fitting Aluminum Vibrant Performance 6 AN Male Straight Union Adapter Fitting Aluminum Vibrant 4AN to 1 4in NPT Straight Adapter Fitting Aluminum (10216. 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.