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I have a spare Argon/Nitrogen regulator that I used with my kegged wines. Instead of buying a CO2 regulator for my beer, I was able to use this adapter. It works great and there are no leaks. Can't beat the price either.
The local shop that offers nitro mixed gas packages them in bottles which have CO2 style tank fittings. In order to make my N2 regulator work with this set up I need to either swap out the input to the reg or buy an adapter. I chose this adapter. It is a high quality brass unit. I have had no issues with leakage.