The history of the Italian company RMS dates back to 1945, which still produces first-class replacement and accessories in absolute OEM quality for classic Vespa scooters.
With almost all classic Vespa gear scooters, the fuel tap is inserted into the tank from the outside/bottom but screwed with a nut from the inside of the tank. If you have a necessary change, you will quickly face the problem of how to get to the mother!
With the special 32 mm fuel tap wrench from RMS loosening and tightening the internal nut is a breeze. Tip: always mount the new fuel tap with a new seal.
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Longer description and suitable vehicles at http://www.amazon.heavytuned.de/data1485154.pdf