Up for grabs today is a new Triumph pre-unit gear box sprocket nut with seal. What makes this part better than using an original nut is that this nut comes with a seal installed.

Now you can stop oil leaks in addition to securing your gear box sprocket. Made and designed in England to replace Triumph part number 57-0440, T0440 and T440. Fits Triumph 650 pre-unit twins (Bonneville, T120R, Tiger, TR6, T110, 6T, etc) from approx 1953-1962.