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"In flushing devices for water closets and urinals, all flush tanks must be equipped with an antisiphon fill valve. The fill valve backflow preventer shall be located at least ______________ above the full opening of the overflow pipe. A. 1 inch (25 mm) B. 1 1/2 inch (38 mm) C. 2 inch (51 mm) D. 3 inch (76 mm)!"
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