2.5” inch round air stone has 3/16” port for air hose.

Increase Water Circulation when used with high-output Air Pump such as Southern Hydroponics 12W Air Pump

Great for fresh, salt water, aquariums and hydroponic use

Air Bubble Disk Stone Aerator Aquarium Hydroponic Oxygen Plate Fish Tank Pump~.

Condition is "New". Shipped with USPS First Class.