CPR CS202 SIPHON AQUARIUM OVERFLOW BOX by CPR Aquatic. **** Overflow Box Selection Chart **** **** PRODUCT MANUAL **** 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 Overflows/Prefilters 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. The advantages of CPR Continuous Siphon Overflows/Prefilters include: * Adjustable water level allows you to easily change the level in your tank. * Black top reduces algae growth. * Plastic screen to prevent fish loss. * Quiet operation. CS202 Specifications: * Flow Rate: 1,500gph * Outflow Size: 2 x 1" Bulkheads * Width: 9 3/8" * Dimensions: A: 9.5", B: 9.75", C: 2", D: 1.5", E: 6" , F: 5.75", G: 9.25", H: 6.75", I: 4", J: 3.5", K: 4 7/8"