I don't understand your question. When a CO2 tank finishes, then you take it to a store (i.e. where you bought it from, or failing that, a welding or fire extinguisher store), and they will refill it for you.
Are you referring to "end of tank dump?" If so, a quality needle valve will prevent this from occurring.
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Anthony
Eheim Pimp #362 - Eheim 2213 x2, Eheim 2028, Eheim surface skimmer and Eheim autofeeder.
Victor Pimp #33 - HPT272-125-350-4M
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