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 6135-00-990-1822
NSN 5935-01-359-6197
NSN 6130-01-196-7890
NSN 6105-01-299-2332
NSN 5895-00-888-4719
NSN 5985-00-925-0103
NSN 6130-00-504-2956
NSN 5910-01-219-8888
NSN 6650-01-044-6377
NSN 6145-01-423-6628
NSN 6135-01-515-6600
NSN 5930-01-421-6575