Reference parts book 0532-lp-103-0916, section 6, page 93, figure 6.44, item 10
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 6110-01-273-0223
NSN 6685-01-535-1320
NSN 6150-01-514-5993
NSN 5998-01-049-3993
NSN 5935-01-422-3228
NSN 5935-00-209-6774
NSN 5910-01-282-8948
NSN 5835-01-034-5206
NSN 5945-00-358-7652
NSN 6150-01-434-0241
NSN 6130-01-618-4114
NSN 6240-01-212-9586