Eshopps Overflow Boxes

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Availability: See Individual Item

Product Name Price Qty
Eshopps PF-Nano Overflow Box
(Order by 3:30pm EST for Same Day Shipping (M-F))
Eshopps PF-300 Overflow Box
(Order by 3:30pm EST for Same Day Shipping (M-F))
Eshopps PF-800 Overflow Box
(Order by 3:30pm EST for Same Day Shipping (M-F))
Eshopps PF-1000 Overflow Box
(Order by 3:30pm EST for Same Day Shipping (M-F))
See Individual Item

eshopps PF-Nano

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  • eshopps PF-Nano
  • eshopps PF-300
  • eshopps PF-800
  • eshopps PF-1000


Assemble the parts making sure that the water exits from the Intake Box through the U-tube and into the Pre-filter Box.

To begin the siphon, fill the aquarium until water flows into Intake Box. Then carefully fill the Pre-filter Box with a cup or two of water.  Remove the excess air out of the U-tube using clear airline tubing (1 ft) until the U-tube is full of water. This is done by bending the airline and inserting it into the U-tube. Be sure the ends of the U-tube are fully submerged so that no air can enter. You may need to add more water to the boxes as you do this. The siphon is now primed and water will automatically reach an even level in both boxes.

NOTE: No air must be allowed to enter the U-tube if the siphon is to be maintained.

If the level of water in the aquarium increases, it will enter the Intake Box and will then siphon into the Pre-filter Box. The water level in the Pre-filter Box will rise until the water flows into the Exit Tube where it will empty into the sump. The main water pump in the sump will then return the water back into the aquarium and continue this cycle. As with any overflow system, it is critical to maintain constant water levels by means of a top-off system or by regular top offs.

Nano Box Overflow Box

To Install Nano Box Overflow Box (Manufacturers Recommendation)

  • Slide a PVC Pipe into the 3/4" ID opening of the bulkhead.
  • Slip the tubing over the opposite end of the PVC pipe.
  • Glue in place to seal.

Quick Overview

Premium overflow boxes for wet/dry aquarium filters
Easily Transports aquarium water to sump
Includes Bulkhead Fittings for simple and effective plumbing

EshoppsQuality overflow boxes feature bulkhead fittings for secure and convenient installation. Use these easy-to-install overflow boxes to transport aquarium water to under cabinet sumps, refugiums, or wet/dry filters. Gravity-feed system eliminates the need for complicated drilling or aquarium modifications.

Includes: U-tube, cylinder (round) foam, nylon screw and wing nuts, and pre-filter box. Nano has 3/4" bulkhead, PF-300 - PF-1200 have 1" bulkheads, and PF-1800 has 1-1/2" bulkhead.


  • 4"L x 2.5" W x 8.5"H

  • For aquariums up to 50 Gallons

  • Max Flow Rate: 200 GPH


  • 6"L x 3" W x 10"H

  • For aquariums up to 75 Gallons

  • Max Flow Rate: 300 GPH


  • 8"L x 3" W x 10"H

  • For aquariums up to 125 Gallons

  • Max Flow Rate: 800 GPH


  • 9"L x 3" W x 10"H

  • For aquariums up to 200 Gallons

  • Max Flow Rate: 900 GPH

Additional Information