Disk-shaped aquarium airstone adds vital oxygen Aerates aquarium water to increase oxygen content Oxygen-rich water helps ensure healthy aquarium fish These bubble disks greatly increase the surface agitation needed for a healthy aquarium. Plus, they produce a visually appealing effect that adds to your display. Requires air pump and airline with 3/16" connection. Delivers a 4"-5" diameter bubble spray. Colors may vary. Sorry for any inconvenience.Medium4" diameterLarge5" diameterPlease click on "More Information" for directions for use.

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