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UrBlindNow has pretty much the right idea.
That spray that comes out when you unscrew your tank isn't coming from the tank. It is the compressed gas that is still inside the gun and all its air passages. The valve on the tankis closed after the first turn or so. So, it isn't wasting air, but it can destroy your tank O-ring pretty good.
A way to avoid this is to unscrew the tank slightly, like a 3/4 turn and fire a few times without paint. If the marker keeps recocking, unscrew the tank about another 1/2 turn and shoot some more. Once the marker burps and doesn't recock, unscrew the tank.
An On/Off will let you just turn the tank off, and then shoot till the gun is empty. You won't have to fool with unscrewing the tank the right amount.
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