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Say goodbye to those tanks that thread on super tight once they start to air up. Our small inline design On/off turns on when you rotate the outer ring, loosen it to turn off and it purges making tank removal a breeze. Newest On/Off w/purge is used in between your bottom line ASA and your tank. Easy to use with a twist to turn outside ring. Say goodbye to those hard to thread tanks once they start to air up. Use on virtually any marker, INCLUDING THE INVERT MINI!!!