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P-706.5 Flush Valves in Water Closet Tanks
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Flush valves for water closet tanks shall close tight. Flush valves in high tanks of the gooseneck type shall be permitted with a 1 1/4 -inch spud and pipe. In low water closet tanks, the flush valve shall have a 2-inch spud and pipe. Flush valves in low water closet tanks shall be equipped with an overflow, except when the tank is provided with an integral overflow. All overflows shall be arranged and installed to conform to the provisions of Section P-804 and Section P-806.
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