Transmission/Hydraulic/Differentials drain plug gasket.
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Ford tractors: 2N, 9N, 8N, NAA, Jubilee, 501, 541, 600, 601, 620, 621, 630, 631, 640, 641, 650, 651, 660, 661, 700, 701, 740, 741, 800, 801, 820, 821, 840, 850, 851, 860, 861, 900, 901, 941, 950, 951, 960, 961, 2000 (4 cylinder), 4000 (4 cylinder).
Transmission/hydraulic filler plug. Ford: Tractor: 8N (if using updated shift cover), 501, 541, 600, 601, 620, 621, 630, 631, 640, 641, 650, 651, 660, 661, 700, 701, 740, 741, 800, 801, 820, 821, 840, 850, 851, 860, 861, 900, 901, 941, 950, 951, 960, 961, 2000 (3 and 4 cylinder), 2030, 2031, 2100, 2110, 2111, 2120, 2130, 2131, 2150, 2300, 2310, 3000, 3100, 3110, 3120, 3150, 3190, 3300, 3310, 3330, 4000 (3 and 4 cylinder), 4031, 4040, 4110, 4121, 4131, 4140. Industrial: 1801, 1821, 1841. Massey Ferguson: TE20, TEA20, TO20, TO30.