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50 Gallons or Less & Complete Kits

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 21 - 40 of 45 results
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CPR Aquatics CS100 Siphon Overflow
Your Price: $109.99
CPR Aquatics CS100 Siphon Overflow
With New Grated Overflow
CS102 Siphon Overflow 1200 GPH (Grated Overflow)
Your Price: $113.99
CS102 Siphon Overflow 1200 GPH (Grated Overflow)
With New Grated Overflow
CPR Aquatics CS202 Siphon Overflow
Your Price: $137.19
CPR Aquatics CS202 Siphon Overflow
With New Grated Overflow
E-Shopps Round Small Foam
Your Price: $7.99
E-Shopps Round Small Foam
E-Shopps Round Large Foam
Your Price: $9.99
E-Shopps Round Large Foam
Eshopps Square Small Foam
Your Price: $8.99
Eshopps Square Small Foam
Eshopps Square Large Foam
Your Price: $9.99
Eshopps Square Large Foam
Aqualifter Siphon Overflow Pump
Your Price: $16.06
Aqualifter Siphon Overflow Pump
CPR Overflow Pump
ADHI Over Flow Box- Single Drain
Your Price: $69.21
ADHI Over Flow Box- Single Drain
free shipping
ADHI Over Flow Box- Dual Drain
Your Price: $75.23
ADHI Over Flow Box- Dual Drain
CPR Aquatic 4" 200 Micron Filter Sock
Your Price: $8.99
CPR Aquatic 4" 200 Micron Filter Sock
CPR Aquatic 7" 200 Micron Filter Sock
Your Price: $9.99
CPR Aquatic 7" 200 Micron Filter Sock
Maggie Muffler Quiet Overflow Box Stand pipe Cap Fits 1 - 1.5"
Your Price: $18.95
Maggie Muffler Quiet Overflow Box Stand pipe Cap Fits 1 - 1.5"
Fits any 1 - 1.5" Standpipe
Maggie Muffler Quiet Overflow Box Stand pipe Cap Fits 1.25 - 1.5"
Your Price: $18.95
Maggie Muffler Quiet Overflow Box Stand pipe Cap Fits 1.25  - 1.5"
Fits any 1.25 - 1.5" Standpipe
Aqueon Overflow Accessory Kit
Your Price: $54.99
Aqueon Overflow Accessory Kit
12 Inch Reef Ready Plumbing Kit
Your Price: $27.49
12 Inch Reef Ready Plumbing Kit
16 Inch Reef Ready Plumbing Kit
Your Price: $28.99
16 Inch Reef Ready Plumbing Kit
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