That’s the McCann Big Mac carbonater (funny enough, no relation to the McD Big Mac) probably. Or the syrup pump which can be electric or CO2 powered. Most plac

That’s the McCann Big Mac carbonater (funny enough, no relation to the McD Big Mac) probably. Or the syrup pump which can be electric or CO2 powered. Most places that serve a lot of draft beverages have a big tank outside the building that gets filled from a truck, otherwise they have a service contract with a local company that swaps out CO2 tanks. A McDonald’s would probably use 100# tanks (which weigh like 150 full) so you wouldn’t have employees do that.