Only if there is a serious problem with the tank. You will need to have your tank hydro tested after a set amount of years though(except for tanks less than two inches in diameter). Also certain Carbon Fiber tanks must be replaced in five years. If the tank leaks when screwed into the gun you will need to replace the o-ring. The o-ring is the plastic/or rubber ring on the tank at the top above the thread. These o-rings are cheap to buy and will last for a long time.
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