Fine Bubbles: This air stone can produce an abundant cascade of tiny bubbles bursting constantly. Greatly boost the oxygen permeation into the water and bring enchanting landscape. Model: Y60; jetting volume: 2.5 L/min; recommended air pump power: > 2 W; standard ID airline tubing: 3/16 inch. Perfect for small fish tanks, aquariums or glass buckets. Free Adjustment: Come with a two-way control valve to manually control the air flow. Simply twist its knob to freely regulate the bubble strength for your multiple needs. Resetting Method: It is normal if only a small amount of bubbles are generated after correct connection. Please turn off the pump, keep it off for about 5 seconds and then turn it on.(Pump Not Included) Easy Maintenance: Clean the stone once a month to prevent clogging. Just soak it in the water, brush its surface mildly and dry it naturally in a cool and ventilated place. This aquarium air bubble stone which can create a very dense cloud of small bubbles quietly. when the bubbles burst into the water, the sound is quieter. Create lots of thin bubbles in fish tank, make dazzling curtain effect.