Collar has a flnage on one end; used on the heater/ac front
A straight formed fitting with identical internal ends, used to form a connection of two air conditioning-heating fittings.
NSN 4140-00-009-3586
NSN 4140-01-081-4790
NSN 5975-00-905-5194
NSN 6220-01-423-9491
NSN 5998-00-351-5335
NSN 6320-01-415-0953
NSN 5835-00-415-6421
NSN 5998-00-023-8094
NSN 6105-01-416-0997
NSN 6150-00-134-1080
NSN 6620-01-098-2960
NSN 5910-01-570-7343