Used as a reusable exhalation port
NSN 4140-01-364-9797
NSN 6135-00-182-7008
NSN 6105-01-394-8783
NSN 6130-00-707-7732
NSN 2925-00-555-8836
NSN 6145-01-334-0046
NSN 5895-00-539-8322
NSN 5855-00-832-9341
NSN 6620-01-599-2011
NSN 6685-00-058-9526
NSN 5945-01-125-0943
NSN 5905-01-467-9990