Repair toilet making high pitched noise, hisses, is whistling when flushed, won't stop filling or is slow filling. Flush the fill valve to remove debris and dirt in a Fluidmaster fill valve. Mineral build up can also cause cause all of these problems. If cleaning does not work replace the fill valve seal.
Link to Korky Fill Valve Maintenance: • Toilet Fill Valve Repair Korky and Toto
Link to Clean Korky Valve: • Fix a Toilet Fill Valve That Keeps Running
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