OK – you figured it out without the instruction manual. It was an after markret device for those who wanted to “top off” a six gallon tank that still had some gas in it. The volume of the device is 1/24 of the tank volume – one quart. To top off a partially filled tank you closed the port and put in oil to the “Full” mark, Then opened the port and added the gas to the “Full” mark. Shaking the can vigorously resulted in a perfect 24 to 1 mixture. They were kind of expensive, but still less tan a new tank. You were assured you could always eave the dock with a full tank of perfectly mixed fuel.
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