Oil seals are also known as radial oil seals, radial shaft seals or rotary shaft lip seals. Oil seals generally consist of a flexible rubber lip bonded to a rigid metal case. Most also contain a garter spring that fitted into the rubber lip to provide additional sealing force.
MOS, 8 X 20 X 5 METRIC OIL SEAL
OS, 3.125 × 4.125 x .562 KLOSURE SEAL