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Insert the CO2 tubing into the cap and then put a rigid piece of tube or a hose connector nipple into the end of the CO2 tubing. Pull the CO2 tubing out of the cap so that the rigid piece of tube or hose connector wedges the CO2 tubing into place. I've never had to use silicone to seal the CO2 tubing / cap connection area using this method.
 
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