AQUANEAT Aquarium 4 x2 Cylinder Air Stone Fish Tank Aerator Diffuser Hydroponics (4 pcs)

Features: Fit for 3/16 standard airline tubing Made of safe, washable and non-toxic material. Accelerate oxygen replenishment Increase water circulation when used with a high-output air pump Great for freshwater, saltwater/reef aquariums and hydroponic use Dimension: 2 D x 4 H