This Clamshell round fuel dot is very easy to use:

It has a fuel inlet and two fuel outlets. With only one finger, user can open the clamshell, insert fuel nipple. At this time, the outlet to engine will be closed automatically.

The fuel goes into the fuel tank through the outlet to fuel tank.

Ater fill up the tank, pull out hte fuel nipple, the outlet to engine will be open automatically, the fuel inlet to fuel tank connects to fuel inlet to engine.

User only need to close the clamshell to finish the prodedure.

From now on, filling is Simple and Easy!