The Colombo 800g CO2 Bottle is a non refillable pressurised bottle specifically for the Colombo CO2 Nano Kit. That kit comes with a smaller 95g bottle which means it can run out quickly. But now we have the solution.
In order to use this bottle, you will need to use the Colombo CO2 Adaptor. This screws onto the 800g bottle and then you simply screw on the regulator that normally accepts the 95g bottle.