Rock Fish Cave 25" Long Replacement Cooling Fans The box sits inside the

The box sits inside the liner and holds fill valves up to 13" long

Multiple extensions can be used if needed

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

if you order more

Rock Fish Cave 25" Long Replacement Cooling Fans The box sits inside theKeep 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