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🐠【Buy 1 get 6 accessories】 the air stone kit includes a 4-inch Nano air disc stone, 1 control valve, 1 check valve, 2 suction cups, 1 tee connector, 1 reducer of connecting 8mm and 4mm. Please note air tube and air pump are not included 🐠【Ultra-high dissolved oxygen】 this upgraded hygger air stone releases the bubbles more smaller, denser, uniform, which makes double oxygen dissolving rate in water. Please note air tube and air pump are not included 🐠【Produces small & dense bubbles quietly】 push out amounts of smaller and denser smooth bubbles than others, when the bubbles burst into the water, the sound is quieter. It can creat the atomization effect and bubble beams will make your aquarium like a fairyland