It is used as a vent and for dumping fuel in an emergency.
Classification: Other parts of airplanes or helicopters for use in military aircraft (excludes propellers, rotors, undercarriages, and parts thereof)
NSN 6240-01-270-5998
NSN 5910-00-584-4508
NSN 6220-01-365-9048
NSN 6650-01-168-1659
NSN 5835-01-131-2027
NSN 6220-01-540-3362
NSN 5985-01-112-1835
NSN 5950-01-616-0521
NSN 5835-01-527-2629
NSN 5975-00-677-2012
NSN 6685-01-519-9250
NSN 5935-00-419-8277