The AquaVita 4'' Trapezoid Air Stone helps maintain healthy root conditions in hydroponic systems. This compact air stone connects to an external air pump and disperses air into fine bubbles that increase dissolved oxygen throughout the reservoir. Its trapezoid shape provides stable placement and targeted airflow, making it suitable for buckets, tanks, and deep water culture setups. B... https://www.hydroponicstown.com/857604-aquavita-4-trapezoid-air-stone