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#31
11-02-2010, 01:16 PM
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Its around a 2in. hole. Not sure of the exact size but could look it up. Anyways it takes a bulkhead for a 1.5 in. stack and drains, which is the only size I would do unless going duel overflows or the ever popular "herbie". I have never done one but with the popularity on here, thats the route I would choose now.
Lots of plans on here for the herbie, including with externals. I think my bit may be to large for them however. My tank has a 1.5 in. Duraso, which I drilled my self but uses the standard corner overflow.
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Doug 
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