4 Pack of 4.2" Inch Aquarium Air Stone -  

Southern Hydroponics Air Bubble Stone with Suction Cup for Hydroponics, pond, aquarium, fish tank, etc. SH-014-4

Adds oxygen to your Aquarium, pond, hydroponic system, and Aquaculture. Creates bubbles to increase dissolved O2 levels for for aquatic life for respiration, extending the life of the nutrient solution, promoting plant growth and keeping fish and roots healthy.

Reliable Material: The aquarium air stones are made of mineral material and sintered at a high temperature, it causes no effect to the health of your aquatics. Keep fish or roots growing healthily. Recommended air pump power: > 4 W; Inner diameter of tubing: 3/16" or 3/8". Great for aquariums, DWC systems or ponds.

Comes with 3 easy to mount suctions to stick securely in place to tank or system. Made with ABS, black and gray.  Product measures 107 mm long(4.2”), 19mm high(.75”).

Condition is "New". Shipped with USPS Ground Advantage