Brake fluid reservoir connection rubber For the connection from the glass container to the master

brake cylinder. Dimension: Diameter above: about 20-21mm. Diameter down: about 12mm. Inside diameter down: 6.0mm. This system of the securement was used by many france classic car`s. E.G. Citroen 11CV + 15CV, Citroen HY, Citroen Ami. Peugeot + Renault.