This air stone is bigger compared to the one used for aquariums, This is because of the Air compressor used in bigger vessels like a cat fish pond is higher and thus requires and air stone with more air space to work effectively.
The advantage pf plastic airstone over stony one is that it dosnt break off like stones.
Fasten air stone to one end of the hose and the other end of the hose to the air compressor.
1.5 inches DIAMETER by 1.5 inches height