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Whats the reason for the different size holes in the center tube?

April 26, 2017center different size tube

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Whats the reason for the different size holes in the center tube?

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The graduated hole sizing in the internal tube is the secret to the Sure-Flo self-cleaning strainer’s uniform flow from top to bottom of the screen. Without the “hotspot”, common with most other self-cleaners, The Sure-Flo is more resistant to clogging and easier to clean.