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Regular one or the heavy duty one? Not sure what "1/2" means.
I probably have a regular one around, because I replaced a couple with the big ones.
 
i have these..

tunze.jpg
 
^^^^ Yes that's it. They sell them seperately and they are great for things other than powerheads. One of the ones they sell separately is rated for 1/2 glass. And I need the one that is sealed for inside the tank.
 
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