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A FE doesn't need to be 100% upright to work for aquarium use, in fact upside down would be the best to make sure that only gas ever enters the valve. See picture below.
I have seen peoples logs with FE's squeezed in at 45 degree angles, no problem.
The dip tube in the there to draw liquid CO2 out the bottom of the tank when the FE is used to put out fires. In aquarium use such a small amount of CO2 is being used liquid never has a chance to get past the valve and into the regulator, it all turns to gas long before it gets there.
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