Oxygen is a key component to a healthy start to your ferment.  Other methods of aerating your wort either require exhausting amounts of shaking a carboy, or "fish pump" methods that risk contamination.  By using pure oxygen you reduce the amount of time needed to about 1-2 minutes, and limit the possibility of contamination.

This kit includes a regulator made to fit the disposable "welding" type tanks commonly available at any hardware store, (I bought my last one for $6.95).  Also included is a 100% Stainless steel diffuser stone, and 3' of tubing.  This stainless steel stone can be boiled for cleaning and sanitizing and has improved durability over other types of diffusers. 

Both the Regulator and the Diffuser come with 1/4" barb fittings for easy hookup with any 1/4" tubing commonly used in brewing.

YOU CAN ALSO USE THIS STONE FOR CARBONATING! Attach 2' of 1/4" tubing from the "gas in" dip tube inside the keg. (Tubing not included). You set your desired pressure on the regulator and gas gets emitted through the .5 micron stainless stone. The half micron bubbles rise through the beer creating so much surface area contact between gas and liquid that the absorption rate is very rapid. This is very similiar to how beer is carbonated in breweries.