Penn-Plax presents the Small World Fishbowl Under-Gravel Filter Kit. This kit is specifically designed for all drum or round bowls with a 4” or larger opening. If filter plate does not fit through the opening, you can break away the outer ring from between 2nd and 3rd levels, allowing for a better adjustments. Larger Base Diameter with outer ring is 5” / Smaller Base Diameter with inner ring is 4”.

ADJUSTABLE FILTER: The Small World Fishbowl Under-Gravel Filter Kit by Penn-Plax is specifically designed for all drum or round bowls with a 4” or larger opening. If filter plate does not fit through the opening, you can break away the outer ring from between 2nd and 3rd levels, allowing for a better adjustments. COMES WITH EVERYTHING YOU NEED: This Kit comes with an Air Pump, Air Tubing, Under-Gravel Filter with Adjustable Base, a Disposable Filter Media Cartridge, an Air Stone, and an Adjustable Flow Valve. TOP-QUALITY CARBON: Supercharged with scientifically formulated Carbon, the media cartridge in this kit absorbs ammonia, nitrites, nitrates, and phosphates in a fast and timely manner, along with removing harmful chemicals and toxins, clearing up discolorations, and reducing foul odors from your fishbowl. BIO FLOSS: In addition to the Carbon, the included media cartridge also contains Bio Floss for physical filtration of larger particulate matter, and biological filtration that optimizes the colonization of anaerobic bacteria. AIR-TECH PUMP: This Kit comes standard with an Air-Tech AT2K0 pump. In addition to being quiet, efficient, and reliable, this air pump is built with a strong motor that’s made to last. With silicone polymer flappers, a thick cover, and raised rubber feet, this pump will remain in place.