Reference parts book 0532-lp-103-0916, section 6, page 93, figure 6.44, item 15
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 6620-00-179-1884
NSN 7035-00-495-2137
NSN 5905-01-235-1144
NSN 6130-01-604-9074
NSN 5910-01-571-8500
NSN 5975-01-361-8857
NSN 5895-00-405-2473
NSN 5915-01-599-8846
NSN 6220-01-114-4688
NSN 4140-01-451-7829
NSN 5999-00-192-4681
NSN 5925-01-139-6337