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OF Series Overflow Box 

Marine Depot Overflow Box is a high quality and economical hang-on overflow box that allows you to easily add a sump, 
refugium or wet/dry filter to your aquarium filtration system. These overflow boxes allow you to skim water from the 
surface of the aquarium and deliver it to your external filter without the need of expensive modifications to your 
aquarium. U-tube design allows for easy and convenient installation. Adjustable pre-filter height allows you to adjust the 
water level inside your aquarium.  

Please read the entire directions before and during 
installation to ensure proper operation.  

Package Contents 

1. Bulkhead Assembly
2. U-Tube
3. Airline Tubing
4. PVC Pipe with Vent Tube
5. Noise-Reducing Cylinder Foam Sleeve
6. Nylon Screw and Wing Nut
7. Black Surface Overflow Box
8. Overflow Body

** Please inspect items carefully for damage or missing 
parts. In the unfortunate circumstance that your item 
may be damaged or have missing parts, please contact 
Marine Depot immediately.** 

Summary of Contents for Nano OF Series

Page 1: ...ws for easy and convenient installation Adjustable pre filter height allows you to adjust the water level inside your aquarium Please read the entire directions before and during installation to ensure proper operation Package Contents 1 Bulkhead Assembly 2 U Tube 3 Airline Tubing 4 PVC Pipe with Vent Tube 5 Noise Reducing Cylinder Foam Sleeve 6 Nylon Screw and Wing Nut 7 Black Surface Overflow Bo...

Page 2: ... Vent Tube into the bulkhead opening on the inside of the overflow body Place the noise reducing cylinder foam sleeve over the PVC pipe with vent tube 2 Unscrew wing nut from nylon screw Insert nylon screw into black surface overflow box and attach to the overflow body slide black surface overflow box up and down to desired water level Hand tighten wing nut to the back side of the hanging bracket ...

Page 3: ...e fewest bends in the drain line will ensure the quietest operation 5 Insert one end of the airline tubing into the opening of the U Tube and push until your airline reaches about the top center of the U Tube Place the U Tube between the two boxes ensuring that the inserted airline end is place inside of the overflow body Allow the U Tube to rest inside of the empty narrow chamber opposite of the ...

Page 4: ...umulate at the top of the U Tube as proper water flow will force any bubbles all the way through the U Tube If air accumulates in the U Tube check to make sure the overflow box is completely parallel to your aquarium and your return pump has sufficient water flow 10 Proper attention must be given to the external filter Ensure that the return pump is completely submerged and that your filter is not...

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