Quick Change 12g CO2 Cartridge Adapter We will use international first class mail.It usually takes about 13 business day to US from China. This Up for sale is a device that allows the use of 12 gram CO2 cartridges in any marker with a standard ASA tank thread. Nothing elaborate about using it. You just attach the front piece to the standard ASA, slip a 12 gram CO2 cartridge in the rear tube, and tighten. The cartridge is pierced and the CO2 flows into the marker...