Often, we get calls about a leaking CO2 system. It is very rare that a component is failing to cause this leak. Under most circumstances, reviewing the installation and set up of the CO2 components will resolve you issue. You want to make sure you have the washer installed at the tank side of the regulator and the duck bill washer (or one way check valve) is installed at the coupler. If one of those are not present, you will have a CO2 leak. You may also have a loose clamp or one of the nuts to tighten the components are loose. Click on the link and review the video below for a better visual.