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 6240-01-411-4603
NSN 6105-00-011-8083
NSN 6145-01-255-2878
NSN 6620-01-176-6956
NSN 5996-01-503-0742
NSN 5950-00-403-7413
NSN 5950-01-436-4459
NSN 5895-01-576-6528
NSN 7035-01-067-8991
NSN 6145-01-152-2417
NSN 6610-01-100-3662
NSN 5950-00-446-4477