Instructions: Soak in water for at least 1 hour before operating.Position in tank. Bury the bottom third of airstone with gravel or stones.Attach to pump with airline tubing and a check valve (sold seperately). Air pump sold separately.
Petco 4" Airstone Bar for Fresh and Saltwater Aquariums
Dimensions: 4" Length
Petco 6" Airstone Bar for Fresh and Saltwater Aquariums
Dimensions: 6" Length
Petco 12" Airstone Bar for Fresh and Saltwater Aquariums
Dimensions: 12" Length