Not all kegs use the same type of gas. Cold brew coffee and cold brew tea kegs use nitrogen gas while beer and kombucha use co2. We refill both nitrogen and co2 tanks and handle all aspects of the tank refill. This includes coming to your office to disconnect the empty tank from the regulator, refilling your gas tank and returning to your office to install the new tank. After the new tank is reinstalled, we will do a function test and make sure the psi is set to the correct level.