This remarkable little system fits in any refrigerator with shelf depth of at least 17 inches. Keg an entire 6 gallon batch of beer in four little kegs, and tap them as needed. The tap system uses small 8 gram CO2 gas bulbs to dispense beer AND to keep beer fresh. The system can also be used for WINE dispensing! Be sure to order an extra set of four kegs, allowing you to have fresh batches aging while serving another batch.