CPR Aquatic CPR CS50 Overflow Box
For glass or acrylic aquariums up to 60 gal. Flow rate 300 GPH. 6.5" wide 3/4" bulkhead outflow A built in overflow is the most efficient method of draining aquarium water to a filter. If your aquarium does not have built-in overflow, CPR Continuous Siphon are the best means for getting water from an aquarium to a filter system without expensive modifications to the tank. They quietly skim up to six times more water than units with tubes.