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Aquarium Supplies

CPR Overflow Boxes

CPR CS Overflow Boxes 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.
  • Quiet operation.
CS Overflows now feature a grated inlet instead of the fish screen previously included.
Item #Description Price 
CR1511CPR CS50 Overflow Box
For glass or acrylic aquariums up to 60 gal.
Flow rate 300 gph.
6.5" wide
3/4" bulkhead outflow
$90.49
CR1513CPR CS90 Overflow Box
For glass or acrylic aquariums up to 125 gal.
Flow rate 600 gph.
8" wide
1" bulkhead outflow
$113.99
CR1515CPR CS100 Overflow Box
For glass or acrylic aquariums up to 175 gal.
Flow rate 800 gph.
10" wide
1" bulkhead outflow
$139.99
CR1517CPR CS102 Overflow Box
For glass or acrylic aquariums up to 250 gal.
Flow rate 1200 gph.
10" wide
(2) 1" bulkhead outflow
$134.49
CR1518CPR CS202 Overflow Box
Flow rate 1500 gph.
10" wide
(2) 1" bulkhead fitting
$155.99
CR1519CPR CS150 Overflow Box
For glass or acrylic aquariums up to 300 gal.
Flow rate 1600 gph.
10" wide
1.5" bulkhead fitting
$142.99
CR1383CPR 1-1/4 inch Drain Hose $22.49
OE1137Tom Aquatics Aqua-Lifter Dosing PumpNote: AquaLifter Pump is recommended to be used with CPR overflow boxes to draw air out from the C-Siphon$17.99
OE1140Tom Aquatics Aqua Lifter Suction Pre-Filter $4.49
CR1591CPR Overflow Sponge For CS90, 100, 102 $2.49
CPR Overflow Boxes Dimensions:
Reef Aquarium
CPR Overflow Boxes Dimensions
Model #WidthABCDEFGHIJKL
CS506"6 7/8"8"1 1/2"1 7/16"3 15/16"4 3/4"7 1/4"5 9/16"4"3 3/16"3 1/8"2 7/8"
CS907 1/4"7 5/8"9 1/2"1 5/8"1 1/2"4 1/2"5 1/16"8 5/8"5 7/8"3 7/8"2 1/8"3 5/8"2 3/4"
CS1009 3/8"8"10 1/4"1 11/16"1 1/2"4 11/16"5 1/16"9 1/4"6"3 7/8"3 1/4"3 3/4"2 3/4"
CS1029 3/8"7 7/8"10 1/4"1 11/16"1 1/2"4 5/8"5"9 1/4"6"3 7/8"3 3/8"3 3/4"2 3/4"
CS1509 3/8"9 7/8"10"1 15/16"1 1/2"5 3/4"5 3/4"9"6 7/8"4 1/2"3 11/16"5 1/4"3 3/8"
CS2029 3/8"9 3/4"10"1 15/16"1 1/2"6 3/8"5 3/4"9"6 3/4"4 1/2"3 5/8"5 1/4"3 3/8"

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