The AN12 version of the 833 90-degree bulkhead, for the big-bore parts of a system — large fuel returns, dry-sump and cooler plumbing where a straight pass-through would leave the hose fighting for bend radius on the other side of the panel. Male AN12 flare threads at each end mate with standard AN12 hose ends and adapters, and the longer threaded portion accepts a matching AN12 bulkhead nut to clamp against the panel. Because AN12 hose is stiff and heavy, secure the panel properly and clamp the hose nearby so its weight is not hanging on the bulkhead joint.