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A built in overflow box 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 sump style filter system without expensive modifications to the tank.
The advantages of CPR Continuous Siphon Overflows/Pre-filters include:
Tip: Connecting the bleed hose from the overflow to the air intake of a power head will help the overflow continue to work if it draws some air into it. It will also help the overflow restart in the event of a power failure.
The overflow box effectively transport aquarium water to under cabinet sumps, refugiums, or wet/dry filters. These high quality overflow boxes features bulkhead fittings for secure and convenient installation. The U-tube style compact overflow boxes are designed to fit between your tank and your wall to maximize space usage in your aquarium setup. With only 3 in. required between your tank and your wall, these boxes are excellent for optimizing space. Each box includes everything required to attach it to your system.
PF-Nano has 3/4" bulkheads
PF-300 - PF-1200 has 1" bulkheads
PF-1800 has 1.5” bulkheads
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