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The round collar piece, you pry it out from the top of the hole, there are two notches where you can remove it with a slotted screwdriver.
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Roger Vitko
Tunze USA
"He's for every one of us, stands for every one of us, he'll save every man, woman and child in a mighty Flash!"
Current Tank Info: 210 gallon planted tank with Altum Angelfish
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