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Overflow Boxes: CPR
Visit the Filtration Overview Page for recommended equipment for reef, saltwater fish only and freshwater tanks, and for some basic aquarium filtration theory.

We highly recommend viewing The CPR Aquatics CS Overflow video on the CPR Aquatics Web site.
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CPR CS50 Siphon Overflow
CPR Aquatics CS50 Siphon Overflow
Usually Ships in 1 to 2 Business Days

Wholesale Price (Members Only)

We highly recommend viewing the CPR Aquatics CS Overflow video on the CPR Aquatics Web site for a general overview of all the CPR Aquatics overflows.

CPR Aquatics CS50 Siphon Overflow:
  • Max. Flow Rate: 300 GPH
  • Outflow Size: 3/4"
  • Bulkhead Width: 6-1/2"
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 Aquatics Siphon Overflows 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 Lid for the CS50 Siphon Overflow needs to be purchased separately.

We highly recommend using the Aqua Lifter pump with your CPR Overflow to maintain siphon. You may also want to look at our Wet Dry Filter page where we have recommended packages including the Overflow Box, Aqua Lifter pump, return pump, Wet Dry Filter and plumbing.

The advantages of CPR Aquatics Siphon Overflow 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
CS50 Siphon Overflow Lid CPR Aquatic
CPR Aquatic Lid for CS50 Siphon Overflow
Usually Ships in 1 to 2 Business Days

Our Price: (Members Only)

The CPR Aquatic Lid for CS50 Siphon Overflow.
CPR CS90 Siphon Overflow
CPR Aquatics CS90 Siphon Overflow
Usually Ships in 1 to 2 Business Days

Wholesale Price (Members Only)

We highly recommend viewing the CPR Aquatics CS Overflow video on the CPR Aquatics Web site for a general overview of all the CPR Aquatics overflows.

CPR Aquatics CS90 Siphon Overflow:
  • Max. Flow Rate: 600 gph
  • Outflow Size: 1" bulkhead
  • Bulkhead Width: 8"
  • Needs 4.5 inches between back of tank and wall
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 Aquatics Siphon Overflows 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 Lid for the CS90 Siphon Overflow needs to be purchased separately.

We highly recommend using the Aqua Lifter pump with your CPR Overflow to maintain siphon. You may also want to look at our Wet Dry Filter page where we have recommended packages including the Overflow Box, Aqua Lifter pump, return pump, Wet Dry Filter and plumbing.

The advantages of CPR Aquatics Siphon Overflows 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
CPR Aquatic Lid Siphon Overflow CS90
CPR Aquatic Lid for CS90 Siphon Overflow
Usually Ships in 1 to 2 Business Days

Our Price: (Members Only)

The CPR Aquatic Lid for CS90 Siphon Overflow.
CPR CS100 Siphon Overflow
CPR Aquatics CS100 Siphon Overflow
Usually Ships in 1 to 2 Business Days

Wholesale Price (Members Only)

We highly recommend viewing the CPR Aquatics CS Overflow video on the CPR Aquatics Web site for a general overview of all the CPR Aquatics overflows.

CPR Aquatics CS100 Siphon Overflow:
  • Max. Flow Rate: 800 gph
  • Outflow Size: 1" bulkhead
  • Bulkhead Width: 10"
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 Aquatics Siphon Overflow 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 Lid for the CS100 Siphon Overflow needs to be purchased separately.

We highly recommend using the Aqua Lifter pump with your CPR Overflow to maintain siphon. You may also want to look at our Wet Dry Filter page where we have recommended packages including the Siphon Overflow, Aqua Lifter pump, return pump, Wet Dry Filter and plumbing.

The advantages of CPR Aquatics Siphon Overflow 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
CPR CS102 Siphon Overflow
CPR Aquatics CS102 Siphon Overflow
Usually Ships in 1 to 2 Business Days

Wholesale Price (Members Only)

We highly recommend viewing the CPR Aquatics CS Overflow video on the CPR Aquatics Web site for a general overview of all the CPR Aquatics overflows.

CPR Aquatics CS102 Siphon Overflow:
  • Max. Flow Rate: 1,200 gph
  • Outflow Size: 1" Bulkhead
  • Bulkhead Width: 10"
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 Aquatics Siphon Overflows 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 Lid for the CS102 Siphon Overflow needs to be purchased separately.

We highly recommend using the Aqua Lifter pump with your CPR Overflow to maintain siphon. You may also want to look at our Wet Dry Filter page where we have recommended packages including the Overflow Box, Aqua Lifter pump, return pump, Wet Dry Filter and plumbing.

The advantages of CPR Aquatics Siphon Overflows 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
for CS100 Siphon Overflow CPR Aquatic Lid
CPR Aquatic Lid for CS100 & CS102 Siphon Overflow
Usually Ships in 1 to 2 Business Days

Our Price: (Members Only)

The CPR Aquatic Lid for CS100 Siphon Overflow & CS102 Siphon Oveflow.
CS150 CS202 CPR Aquatic Lid for Siphon Overflow
CPR Aquatic Lid for CS150 & CS202 Siphon Overflow
Usually Ships in 1 to 2 Business Days

Our Price: (Members Only)

The CPR Aquatic Lid for CS150 Siphon Overflow & CS202 Siphon Oveflow.
Tom Aquarium Products Replacement Diaphragm for Aqua Lifter Pump
Tom Aquarium Products Replacement Diaphragm for Aqua Lifter Pump
Usually Ships in 1 to 2 Business Days

Wholesale Price (Members Only)

The Replacement Diaphragm for the Aqua Lifter Pump
Tom Aquarium Products Aqua Lifter Water & Air Pump
Tom Aquarium Products Aqua Lifter Water & Air Pump
Usually Ships in 1 to 2 Business Days

Wholesale Price (Members Only)

The Tom Aquarium Products Aqua Lifter is recommended for any application with the CPR Overflow Boxes. The Aqua Lifter will help the Overflow Box to maintain siphon. The Aqua Lifter is a unique one-of-a-kind vacuum pump designed to lift water with its diaphragm and flappers. Note: The Aqua Lifter is not a water circulation pump, it just assists with the siphoning of water out of the tank with an overflow box. You still need a circulation pump to return water to the tank.
   
 
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