4"x2" Cylinder Air Stone Aerator Diffuser Hydroponics SET OF 4

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