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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. 
Plastic screen to prevent fish loss. 
Quiet operation. 
We highly recommend using the Aqualifter pump, available on this page, with your CPR Overflow.

Displaying products 1 - 20 of 45 results
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EShopps PF-Nano Overflow Box
EShopps PF-Nano Overflow Box
Your Price: $50.77
EShopps PF-Nano Overflow Box
EShopps PF-Overflow Box
EShopps PF-300 Overflow Box
Your Price: $60.93
EShopps PF-300 Overflow Box
EShopps PF-Overflow Box
EShopps PF-800 Overflow Box
Your Price: $68.06
EShopps PF-800 Overflow Box
EShopps PF- Overflow Box
EShopps PF-1200 Overflow Box
Your Price: $85.32
EShopps PF-1200 Overflow Box
EShopps PF- Overflow Box
EShopps PF-1800 Overflow Box
Your Price: $91.44
EShopps PF-1800 Overflow Box
Aqueon Hang-On Overflow Box
Aqueon 125 Gallon Hang-On Overflow Box
Your Price: $70.20
Aqueon 125 Gallon Hang-On Overflow Box
Aqueon Hang-On Overflow Box
Aqueon 400 Gallon Hang-On Overflow Box
Your Price: $85.25
Aqueon 400 Gallon Hang-On Overflow Box
Mega Flow Overflow Kit
Mega Flow Overflow Kit
Your Price: $59.99
Mega Flow Overflow Kit
CPR Aquatic Lid for CS
CPR Aquatic Lid for CS50
Your Price: $7.29
CPR Aquatic Lid for CS50
CPR Aquatic Lid for CS
CPR Aquatic Lid for CS90
Your Price: $8.49
CPR Aquatic Lid for CS90
CPR Aquatic Lid for CS &
CPR Aquatic Lid for CS100 & 102
Your Price: $9.29
CPR Aquatic Lid for CS100 & 102
CPR Aquatic Lid for CS &
CPR Aquatic Lid for CS150 & 202
Your Price: $9.69
CPR Aquatic Lid for CS150 & 202
CSSiphon Overflow
CS50 Siphon Overflow 300 GPH
Your Price: $75.99
CS50 Siphon Overflow 300 GPH
CPR Aquatics CSSiphon Overflow
CPR Aquatics CS90 Siphon Overflow
Your Price: $97.99
CPR Aquatics CS90 Siphon Overflow
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