Layshaft Welch Washer (Blanking Disc) as fitted to all pre-unit Triumph gear boxes from the 1950 model year to the end of the pre-units in 1962. Also fitted to the unit construction 350 & 500 models from 1957 to 1961 (for the T100) and to 1963 for the 3TA & 5TA (until the adoption of the closed end needle roller bearing).
MADE IN ENGLAND
OEM: 57-0981, T981