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 5925-01-193-3204
NSN 5930-01-586-2184
NSN 6645-00-004-8628
NSN 5998-01-150-8286
NSN 5945-00-155-4290
NSN 5975-00-084-1928
NSN 5925-00-244-0711
NSN 5996-01-333-9512
NSN 5985-01-424-0768
NSN 6685-01-422-9927
NSN 6220-00-343-0182
NSN 5930-01-574-7601