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I acquired a twenty gallon tank at a flea market, and it has a Vortex diatom filter. I can DIY strainers, but it is missing the U tubes. Are these just tubes, or do they have one way valves?

Thanks,
Wayne
 

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They're just plastic U's, no check valve(s). These are fantastic micron filters to use periodically, but can't be used continuously because of the high velocity of the water.
 
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