Internal

Internal overflow boxes are generally the safest and preferred way to move water from your display aquarium down to a sump. Because they rely on gravity, there is less risk for an overflow. Internal overflow boxes require the aquarium to be drilled, which might sound nerve racking, but if you use a diamond coated drill bit, it’s easier than you’d think! Just be sure that your aquarium glass is not tempered before you start.
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21 Items

  1. Prodigy M Low Profile Overflow Box (700 GPH)
    Eshopps
    Prodigy M Low Profile Overflow Box (700 GPH)
    $179.98

    $179.98
  2. Prodigy L Low Profile Overflow Box (900 GPH)
    Eshopps
    Prodigy L Low Profile Overflow Box (900 GPH)
    $199.98

    $199.98
  3. Eclipse S Overflow Box (600 GPH)
    Eshopps
    Eclipse S Overflow Box (600 GPH)
    $139.98

    $139.98
  4. Eclipse L Overflow Box (1000 GPH)
    Eshopps
    Eclipse L Overflow Box (1000 GPH)
    $159.98

    $159.98
  5. Eclipse M Overflow Box (800 GPH)
    Eshopps
    Eclipse M Overflow Box (800 GPH)
    $149.98

    $149.98