Used on 3810-01-497-1001. o-ring face seal adapters 'orfs' with low temp o-rings M90 degree elbow-male orfs thread to male npt/information shows following companies
Used on c-17a aircraft. 3a 1st end bulkhead thread class fitting, elbow, 90, bulkhead, hose anodize surface treated unjf 1st end bulkhead thread series