juice flow controlI like a tank with a fill port. It does usually require a screwdriver to remove, but there are the key chain screwdrivers for that. We all need at least one of those in our vehicles where we keep the backup juice for out and about.
The problem with top fill is leakage while filling. Unless there's an easy way to seal the air ports with a finger or close them off with an air flow ring valve, top fill can be a pain.
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