How to Adjust a Korky Toilet Take the lid off the toilet tank and set it aside. Locate the Korky fill valve on the left-hand side of the toilet tank. Grasp the top head of the fill valve and rotate it counterclockwise to unlock. Move the fill valve head up or down to adjust the water level. Rotate the Korky head clockwise to lock into position. Click to see full answer. Furthermore, how do you adjust the water level on a Toto valve? How to Adjust the Water Tank Level in a Toto Toilet Shut off the water supply to the toilet. Flush the toilet to drain the water from the tank. Locate the flush valve within the toilet tank. Turn the top of the flush valve assembly counterclockwise 1/2-turn to unlock the adjustment tube. Adjust the valve tube to change the water level. Additionally, how do you adjust the height of a fill valve? To adjust this type of valve, you simply turn an adjustment screw located on the top of the valve. To raise the water level, turn the adjustment screw clockwise; to lower the water level, turn the screw counterclockwise. The water level must be below the top of the tank’s overflow tube. Hereof, how does korky QuietFILL work? QuietFILL® Platinum Fill Valve It is fully adjustable to prevent water waste in all toilets. The refill adjuster delivers the right amount of water to the bowl to maintain original performance. This toilet fill valve is easy to install and adjust; no tools are required.How can I increase the water level in my toilet bowl? Steps Remove the toilet tank lid. Take note of the water level inside the tank. Turn off the water supply to the toilet. Examine the float and fill valve. Examine the toilet tank’s float height. Use a screwdriver to raise or lower the float height. Flush the toilet to test the water level.