IDF Weber vacuum adaptor Superb Webcon manufactured reproduction of the original Weber vacuum adaptor for the IDF range of carburettors. Featuring the correctly sized internal restriction, the vacuum adaptors will allow the use of a manometer to allow very precise setting up of multiple installations of IDF carburettors. British made and of the very highest quality, these are a must for any serious Weber tuner. Tubes are priced per piece and 2 are needed per carburettor. Simply order as many as you need to suit your installation.