Homeowner has a sterling dual flush toilet that runs constantly. The fill tower seal has failed. Stop valve is a quarter turn stop valve with a built in supply line. Recommend replacing the toilet. Homeowner opted to replace the toilet. Removed old sterling toilet and disposed of toilet. Removed stop valve and installed new PEX quarter turn stop valve. Installed new stainless steel braided supply line. Examined flange and verified condition, flange appears to be intact. Installed new Kohler Highline arc. Installed new wax ring with horn and new nylon closet bolts. Flushed toilet approximately 10 times to test for leaks. Sealed toilet to floor with clear silicon. Water pressure in house is 50 PSI.