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 5996-01-438-9421
NSN 6110-00-288-4179
NSN 6105-01-432-9869
NSN 6645-01-076-4655
NSN 5965-00-762-0630
NSN 5975-01-529-1565
NSN 5920-01-089-7903
NSN 5925-00-008-2653
NSN 5930-01-327-1593
NSN 5920-01-527-7656
NSN 5895-01-381-1976
NSN 5975-01-095-3157