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 6130-00-913-2395
NSN 6130-01-049-7843
NSN 6610-01-514-7755
NSN 6130-00-900-7272
NSN 5998-01-085-6299
NSN 5960-00-572-9706
NSN 6130-01-322-3728
NSN 5950-00-364-0764
NSN 5965-00-035-4556
NSN 5975-01-496-7924
NSN 5998-01-089-3617
NSN 5925-00-592-0881