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 6135-01-031-3032
NSN 5945-00-135-7120
NSN 5965-00-735-9315
NSN 6620-00-075-2179
NSN 5960-01-165-1956
NSN 5915-00-136-1020
NSN 6220-00-419-0635
NSN 6145-01-425-0491
NSN 5965-00-834-6298
NSN 5945-01-161-9567
NSN 6685-01-028-5168
NSN 6135-01-100-3593