This video shows you how to easily switch between homebrew ball lock or pin lock corny keg fittings, over to a commercial sanke keg coupler.  This is great for those how brew their own beer or coffee and use Cornelius kegs, but also may need to tap a commercial keg here are there!
Check out these kits which make it easy to switch your lines back and forth between homebrew and commercial kegs! - https://www.kegoutlet.com/commercial-to-homebrew-conversion-kits.html