This is a complete CO2 and beer keg system. I bought an old fridge that didn't have a crisper drawer at the bottom. I made a wood frame and I was able to put 1/2 kegs in it. I then drilled a hole thru the front door and mounted the tap head. It's hard to find a fridge now that doesn't have the crisper drawer, so if you remove it and make a wood frame that is flat above it, you can usually fit a 1/4 keg. I saved a ton of money drinking my favorite beer on tap! I stopped using it because they stopped issuing my beer in kegs. (Molson Golden) There is also a cleaning kit included. Its complete but it's a little rough. There is the door tap head, the keg tap head, a CO2 tank and regulator, as well as the air and beer lines. There is a spare carbon washer for the tank connection and the proper spanner wrench. The cleaning kit has a plastic bottle that attaches to a manual pump and the proper steel cable brushes to clean all the liquid lines. Any questions, hit me up!