Penn Plax Bubbler Bottom Filter SIMPLE AND EFFICIENT: the filter is simple and efficient for all small aquariums and fish bowls, a simple design and efficient filtering, utilizing the  lift tube BOTTOM FILTER SYSTEM: fits perfectly in the corner, or anywhere else on the bottom of your tank. Measures approximately 3.25L x 2.75W SHOP PENN PLAX FOR ALL YOUR PETS NEEDS: Penn Plax is a manufacturer and distributer of top pet supplies, who specialize in creating excellent pet products for animals both great and small