The use of an oxygen system will greatly improve the quality of your fermentation. Oxygen systems help reduce lag time, allow for more active yeast during fermentation, and your fermentation time will last longer. These systems are almost a must with higher gravity beers. The better the fermentation, the better the beer. System comes with valve to attach to an oxygen tank, tubing and stainless steel 0.5 micron air stone. You can find oxygen tanks at any hardware store.