Filler cap

MG Filler cap
on brake master cylinder reservoir

MG MGB with single line brake (France and Benelux only) from April 1967 plus MGB LHD models with dual line brake system less servo from November 1967 to December 1974 (Roadster from GHN4-138401 to GHN5-367900, GT from GHD4-139471 to GHD5-368600)