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I have 2 MP40W Quiet Drive on 3/4 glass, no spacer.
Also have that thin black round sticky rubber attach to the dry side. Make sure that part (rubber) is on the glass and the sticky side on the dry side.
Run them at 1% all night, never had them fall off.
I had the normal MP40Wes, these are so quiet, I never understood how quiet my tank can be, I can hear the overflows now, never could before.
One more thing, the flow are so much more than the old style.
Was thinking buying four of them. With the new style only need two.
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