Viton fuel filler cap seal is supplied bonded to a steel dished plate and is a direct swap for the original part. When the filler cap is closed, it seals against the fuel tank filler neck in the fuel tank. There is also an internal seal with a garter type spring on this component which on these new replacements has been improved. The picture 4 and 5 on this listing show a complete filler cap just to illustrate where the new seal fits. This listing is not for a complete filler cap !
If you have water in the fuel tank, also make sure the water drain hole (from under filler cap to rubber pipe on rear of fuel tank) is clear.
Fuel filler cap metal bonded seal fits 750/900 Trident. 750/900 Speed Triple, 900/1200 Trophy, Tiger 900 (carb), Trident Sprint, Sprint 900, Sprint Sport, Sprint Executive, Super III and 750/900/1000/1200 Daytona.