1-11-1/2 npt thd female connections
A device used to prevent passage of flame through a ventilating duct while air is flowing.
NSN 6220-01-440-9763
NSN 5910-01-291-2853
NSN 5990-00-752-2126
NSN 6610-01-413-3912
NSN 5930-01-074-6086
NSN 5925-01-411-6028
NSN 6130-01-525-7679
NSN 6220-01-461-9643
NSN 5895-00-452-7134
NSN 6685-01-188-4653
NSN 5910-01-381-2110
NSN 5905-01-273-3161