You'll have bubbles galore delivering fresh oxygen to your tank with this long-lasting airstone. Great for both fresh and saltwater tanks. Instructions: Attach airstone to airline tubing. Position in tank, hold in place with gravel, stones or lead weights. Soak in water at least 1 hour before turning on air. Regulate airflow through use of gang or air line control valve. Size: Airstone is 0.5" diameter x 0.4375" long.
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