Adapter comes with tank o-ring. Although the O-ring fits snugly into the groove on the face of the CGA-320, it doesn't seal well, CO2 seeps through it like a Niagara. I solved the problem by adding a second larger o-ring. No leaks. I'm wondering if the adapter is for a different tank flange. Otherwise, the CGA-580 seals the sides well, there is nothing to complain about on this half. All threads have been cut cleanly, the adapter is of good quality.
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