Rock Fish Cave 25" Long Replacement Cooling Fans The check valve is important

The check valve is important for stopping a backflow of water in the event of a power loss

Multiple extensions can be used if needed

20 and 27 inches

These plastic Bio-Balls are a great media for use in all types of biological filters

Rock Fish Cave 25" Long Replacement Cooling Fans The check valve is importantKeep your fish feeling safe and secure with a molded rock cave. Built with tough composites, these natural looking shelters offer safety from predators and weather while blending seamlessly into your pond's landscape. Realistic cave molded from real wood Strong poly resin construction Multiple entrances and exits for easy access Dimensions 25" long X 15" wide X 9. 5" high