For safety valve
A nonmetallic circular item with an aperature, having a solid round cross-section. They are used primarily for sealing. For items with other than round cross section, see packing,preformed. For noncircular items with a round cross-section, see seal,nonmetallic round section and rubber,round section.
NSN 6145-00-205-4046
NSN 6685-00-120-1009
NSN 5950-01-154-9120
NSN 5905-01-598-8607
NSN 6150-00-189-0292
NSN 6320-00-225-7013
NSN 6650-01-150-2320
NSN 6685-01-479-5420
NSN 6130-01-461-7765
NSN 5950-00-161-3953
NSN 5965-01-553-1938
NSN 5935-01-147-3910