Underwater life support iaw navsea instruction 10560.2b
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 6650-00-025-4772
NSN 5855-00-944-0949
NSN 5975-01-192-7305
NSN 2925-01-037-5383
NSN 5905-01-043-0524
NSN 5965-01-497-5961
NSN 6135-01-131-9352
NSN 5960-01-649-1341
NSN 5975-01-329-3469
NSN 5996-01-012-3267
NSN 5990-01-604-0862
NSN 6145-00-526-3056