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The 60Hz version of 9420 has 2.5 rows of needles, the 3rd set is cut in half. The Vertex needle wheel looks more like the 9430 pump which for 60Hz has 3 full rows of needles.
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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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