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CPR CS50 Aquarium Overflow Box

Product code: 26

Availability: In stock

Ships tomorrow if ordered in the next 1 day, 8 hours and 55 minutes!

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CPR CS50 Aquarium Overflow Box

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 feature a grated inlet.


  • Model: CS50
  • Flow Rate: 300gph
  • Outflow Size: 3/4" Bulkhead


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  1. Awesome product and customer service. Review by Leo
    Product Rating:

    Great product as describe, quiet and easy to setup.
    The best was the customer service, great job with quick response. Thanks guys. Excellent service!
    Fast delivery. (Posted on 7/19/2016)

  2. Quiet overlow Review by Zoltan
    Product Rating:

    This is a very quiet overflow. I wish it was easier to clean, but after all I'm really satisfied with it. (Posted on 3/16/2016)

  3. If You Must Overflow Review by KMaeks

    Typical CPR heavy-duty construction. The siphon-maintaining pump assures me that the siphon will not break so long as the pump is working. But I wish there was a way to positively connect the hose to my sump; right now my hose black-taped into the bottom of the CPR overflow. (Posted on 3/23/2009)

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