Dmaxprof:

That bottle is very similar to the bottle that I described in the above post.
The one that I use has the same type of bottle on a bottle and is marked off in ounces 1 thru 4. By tipping over the bottle, fluid will fill the attached bottle to exactly 4 ozs. Being marked off 1 oz increments makes easy to dispense in lessor amounts for maybe a half tank of fuel.
It works very well for me.
Denny