This entire process can be completed in about five minutes, including time spent calibrating the flush valve setting.
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Loosen the top of the valve system by rotating the retaining bolt with an adjustable wrench. This will give you access to the flush valve.
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Use your adjustable wrench to rotate the flush valve. Spin it clockwise to decrease flow, and counterclockwise to increase flow.
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Replace the top of the valve system, when adjustments have been made, and secure the retaining lug with the adjustable wrench.