5 Four Paws Tank Tops are powder coated to inhibit rust and are available in a variety of sizes and styles. The solid screen allows for maximum ventilation. The screen with door allows for easy access for feeding. The Center Hinged Screen allows the pet owner simple, unobstructed access to move and remove items that normally would require the cover to be entirely removed . For added protection, Tank Top Security Clips are sold separately. 5.5 Gallon Tank Top (Metal)