XAS Air Stone These air stones are a perfect match with the Teton Air Pump or Teton Air Pump Kit. The air stone helps to defuse air into a tank and improves the tank environment by producing small bubbles of oxygen into the water. Item #XAS5, Air Stone 5″ with 3/16 & 3/8″ Inlet Item #XAS6HD, Air Stone 6″ Heavy Duty with 3/8″ Barb Inlet Item #XAS8HD, Air Stone 8″ Heavy Duty with 3/8″ Barb Inlet Item #XAS12HD, Air Stone 12″ Heavy Duty with 3/8″ Barb Inlet More Details How to Use Resources coming from acf Product Usage details coming from acf Product resources details coming from acf