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It's a drain guard. Sits there blocking snails or anything from going down the pipe. If you forget to clean the sponge and the water levels rises high enough, it floats up allowing water down the top of the pipe. Those things are old school, pull all that stuff out and build yourself a durso.
The reef ready AGA 75 that I bought 12 years ago came with those. Sponges on the drain are really not used anymore by aquarium builders so I don't know if you will be able to find one for sale anywhere.
Last edited by Jadinop; 12-14-2008 at 11:30 PM.
Reason: more info
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