【Buy 1 Get 4 Free Accessories】The air stone kit includes 2 inch nano air disc stone, 1 control valve, 1 check valve, 2 suction cups. Please note that air hose and air pump are not included 【Ultra High Dissolved Oxygen】 This upgraded Hygger air stone releases the bubbles smaller, denser and more evenly, doubling the rate of oxygen dissolution in water < p>【Quietly produces small dense bubbles】 Squeeze out smaller and denser smooth bubbles than others, when the bubbles burst into the water, the sound is quieter. It can produce the atomization effect and bubble jets make your fish tank like a fairyland 【Weighs enough to sink】 5.2 oz/150 g, sits easily on the bottom without a suction cup. The diameter of the air diffuser area is 2 inches, not including the plastic rim. Suitable for both freshwater and saltwater 【Powered by 2W or greater power air pump】 The 2" air vent is compatible with 4mm airline hose, the output airflow is 1L/min . Please note, the deeper you submerge the air stone,
