The AN8 bulkhead in the 833 90-degree pattern, for the higher-flow fuel feeds, oil cooler and transmission cooler lines that regularly need to pass through a firewall, floor or tank wall. Male AN8 flare threads on both ends connect to standard AN8 hose ends and adapters, and the extended threaded section takes a matching AN8 bulkhead nut that clamps the body to the panel and seals the penetration. The 90-degree bend earns its place here — AN8 hose has enough stiffness that a straight pass-through often leaves no room to turn behind a panel. Drill accurately and deburr both faces.