PERFORMANCE OIL SEAL. A "T" at the end of the part number indicates a Teflon seal. Size:ÿ 25 x 52 x 7 TC. R = ribs on outside of oil seal. T = tips on oil seal. F = flange on oil seal DC = double lip, double spring, rubber. TC = double lip, single spring, rubber. TB = double lip, single spring, steel. ÿ