When I bought my bike it had one of those keyless gas caps. I don't like the idea of not needing a key to access my fuel so I bought a locking gas cap cheap on ebay. The gas cap wasn't sitting flush so I wanted to remove a bit of the rubber ring on the inside. Well I broke the rubber ring. Now the cap sits flush but I know the rubber was a sealant and now there isnt one. Moisture, water can probably get into my tank now. I know the tank has a small drain system under the gas cap but dont I need that ring?? I know alot of the keyless gas caps dont seal with the tank.....they just cover the hole. Isnt the system pressurrized? Do I need the rubber seal?