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Problem with my Class Five Kohler toilet. The toilet only lets out approx 3 quarts of water and the bowl only recovers about 4 inches of water measured from the absolute bottom of the bowl. The tank refills to the 1.6 gal mark but never discharges the correct amount.

Just installed my new Kohler Highline Class Five toilet. The flapper valve closes instantly upon release of flush handle not allowing enough water to flush properly. Only a small amount of water returns to bowl. The temporary solution is to hold down the flush handle for approx. 3 seconds to get...