Aka hippo
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 6685-00-582-6941
NSN 4140-01-149-4803
NSN 6220-01-235-0877
NSN 6645-00-408-7443
NSN 6650-00-896-9468
NSN 5895-01-657-6536
NSN 6150-01-658-5198
NSN 6145-01-501-5780
NSN 6685-01-633-2592
NSN 6320-01-571-8974
NSN 5930-01-620-2598
NSN 5895-01-093-4179