This replacement filter housing holds the Drinkwell® Activated Carbon Replacement Filters (PAC00-13906). The filter housing is compatible with the Drinkwell® Avalon, Pagoda, Sedona, 1/2 Gallon and 1 Gallon Pet Fountains. Features Replacement - Use the Drinkwell® Replacement Filter Housing a spare for your compatible pet fountain Compatibility - Replacement Filter Housing is compatible with Drinkwell® Avalon, Pagoda, Sedona, 1/2 Gallon and 1 Gallon Pet Fountains