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Again I will put my best foot forward and disagree with thatRedbrickman
The top vents are probably making up for changes in atmospheric pressure, however I am guessing that the inner tube is not that flat on the top of the cart and therefore the seal is not completely airtight.
From a engineering perspective it is a fact that something can be watertight but the same seal would not be totally airtight. So that in my mind means that the rubber band stops ink leaking out of the outlet, but air can move freely in and out of the serpentine.
because Tom's Tank Tube is clearly tight all round the cartridge see http://www.nifty-stuff.com/forum/viewtopic.php?pid=42803#p42803
This little invention is doing both jobs at once and until proven otherwise its doing it 100% of the time, in my mind anyway.
So lets try it out and see how many will recommend, promote or use it for their cartridge storage.
Now I have a big foot and some say mouth but it will fit if necessary
and there will be plenty of room left for the ceremonial humble pie too..