Penn Plax is a name that stands for Quality Innovation and Integrity In the Pet Industry for over 50 years Experience a great line of Pet Products in all categories! Penn-Plax is committed to creating and manufacturing innovative pet products for first-time pet owners and serious hobbyists alike. Completely submersible motor! Physical chemical and biological filtration. Circulates and filters water! Reliable quiet motor. Category: Aquarium Supplies/Maintenance. Sub Category: Filters. Cubes: 0.0014. Weight: 0.9400.