There are two different types of soda, as dispensed:
- Post Mix concentrate (Bag In Box) is used at most restaurant, deli, c-store, locations.....basically anywhere that has electricity, water supply, and drain. This change took place a couple of decades ago. Post Mix 'generally' is 5 parts carbonated water to 1 part concentrate syrup.
- What we use as home brewers (Corny kegs) are only used for soft drink pre-mix, where the final product is carbonated and pushed out via co2. You will likely see these at temporary or special event venues, that don't have access to water, electricity, and drain. Product is generally cooled via cold plate/ice, and isn't anywhere near as profitable as post mix, for the most part.
That is why so many of the corny's available are stamped or identified with Pepsi-Cola or Coca-Cola. A majority all of the premix out there (some exceptions) are ball lock....
Good thinking. I was under the impression that ball lock was Pepsi & pin lock was Coke (or maybe I got those backwards) & was just a proprietary thing.