Overflow Box

[SRC]

on what this is used for? I've seen several listed but I can't figure out exactly what you do with them lol.

http/cgi.ebay.com/ws/eBayISAPI.dll?ViewI...4351198934&rd=1

 

[yeeviabetta]

Don't tells me you want to get it to put your new red betta in there. LOL WUV gonna faint! LOL J/K

it already mention in the auction. hope this helps you.

Smoke color acrylic overflow box for aquarium.

This acrylic built continuous siphon overflow box has a flow rate of up to 600GPH. Very easy to setup and easy water level adjustment in the tank. Saving tons of $$$ to modified the aquarium tank. The smoke acrylic material reduces algae growth and the included net screen prevents fish loss. 1” outlet bulkhead fitting included.

 

[SRC]

This acrylic built continuous siphon overflow box has a flow rate of up to 600GPH

That doesn't tell me what it does..or why it does it. I want to know why you need this thing lol.