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| | Print This | This Old House (Site not responding. Last check: 2007-10-26) |
 | | In a toilet with a float-ball ball cock, the ball at the end of a brass rod rises with the water as the tank refills. |
 | | For a floating-cup ball cock, a cup slides up the ball-cock shaft as the water level rises and lifts a wire that trips the ball cock off. |
 | | The bottom of the ball cock could be leaking, the connection between the external water-supply line and the ball cock could be loose, or the tank bolts might have corroded, causing water to seep out. |
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