Installing A Plunger-Valve Ballcock

A ballcock basically is a toilet's only mechanical part. It has a number of moving components that can wear out or break. When that happens, you'll need to replace the ballcock. It's not a difficult job. There are several types of ballcocks – plunger-valve, diaphragm, float-cup, and floatless. They all use similar steps and methods for replacement.

Shut off the water and flush the toilet to empty the tank. From underneath the tank, place a bucket under the retaining nut, then remove the ballcock retaining nut with an adjustable wrench and take out the old ballcock assembly.


Attach a new cone washer to the new ballcock tailpiece and insert the tailpiece into the tank opening.


Align the float arm socket so that the float arm will pass behind the overflow pipe. Screw the float arm onto the ballcock. Screw the float ball onto the float arm.


Bend or clip the refill tube so that the tip is inside the overflow pipe.


Screw the mounting nut and the supply-type coupling nut onto the ballcock tailpiece and tighten the nut with an adjustable wrench. Turn on the water and check for leaks. Note: over- tightening the nut can crack the toilet tank.


Adjust the water level in the tank so it is about 1/2 inch below the top of the overflow pipe, or align with the "full" line inside the tank.





Installing a New Flush Valve


Fixing a Leaky Floatcup Assembly


Making Minor Adjustments

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