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Penn-Plax Small World Fishbowl Under-Gravel Filter Kit

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... more

Penn Plax Clear-free Premium Under Gravel Aquarium Filter For 40 - 55 Gallon Tanks, Crystal | Wayfair CFU55

Those who’ve been around the aquatic block for a while know that Under Gravel Filters (UGFs) are a testament of time. This Filter is air driven and utilizes an Air Pump (not included) to cycle crystal clear water throughout your aquarium, while keeping... more

Penn Plax Clear-Free Premium Under Gravel Aquarium Filter for 20 & 29 Gallon Tanks Acrylic (shatterproof w/ great clarity), in Blue | Wayfair CFU29

Those who’ve been around the aquatic block for a while know that Under Gravel Filters (UGFs) are a testament of time. This Filter is air driven and utilizes an Air Pump (not included) to cycle crystal clear water throughout your aquarium, while keeping... more

Penn-Plax Premium Under Gravel Filter System for 40-55 Gallon Tanks

Provides powerful biological and chemical filtration Trouble free setup and operation Includes filter plates air stones adjustable lift tubes and filter cartridges Available for 5 10 15/20H 20L/29 40 / 55 gallon aquariums more