Pair of metal rings, 'A' type-operating piston. Replaces metal ring where these were fitted. Whist the TR2-3B, TR4 and TR4A parts books say 4 rings are required; we supply these in pairs, so only two pairs are required to service one overdrive.

This part is listed on the following page of the website, where further information and background reading may be found.

This part appears on the following Triumph Catalogue Plates