O-ring, 4 inch I.D. x 5/64 inch thick. For transmission front PTO pinion shaft & input shaft retainer to housing. For 8-speed & late multi-power. Tractors: MF135, MF150, MF165, MF175, MF180. For all 6-, 8-, 12-speed & multi-power except where noted. Tractors: MF235 (except 6-speed), MF240 (except 6-speed), MF245 (excpet 6-speed), MF250, MF253, MF255, MF265, MF270, MF275, MF282, MF285, MF290, MF298, MF360, MF375, MF383, MF390, MF390T, MF398, MF399, MF670, MF690, MF698, MF699, MF1080, MF1085. For industrials except with instant reverse or where noted: 20 except 6-speed, 20C except 6-speed, 20D, 30 except 6-speed, 30B, 30D, 30E, 31 except 6-speed, 40B, 50A late 8-speed, 50C, 50D, 50E.
