Fixing Kohler Toilet Flush Problems. Weak flush or leaking over the flush tube can be fixed with a simple turn of a screw. You are looking for the water level indicator line on the side of the black pipe. If your water level is below the line, turn the screw clockwise. If your water level is above the line you need to turn the screw counterclockwise to stop the toilet from running when it is not supposed to.

свернуть