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Fixing a Leaky Cistern


 
 
 
Step 1: Introduction
Step 2: Drain the Cistern
Step 3: Remove the Float Arm
Step 4: Locate the Piston
Step 5: Replace
   
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Step 1: Introduction

If you notice drips coming out of the cistern overflow pipe outside your home (or in newer cisterns down through the toilet pan), you may have a ball-cock washer that needs replacing. This is a simple DIY job for which you will only require a screwdriver, a pair of pliers and a standard ball-cock washer.


If the cistern mechanism does not have a brass arm, your cistern may require a special washer. Please check before purchasing.


 
 
 

Step 2: Drain the Cistern

Turn off the water supply at the cistern stop cock and flush the toilet to drain the cistern.


 
 
 

Step 3: Remove the Float Arm

Remove the lid of the cistern. Take the float arm off by using the pliers to remove the split pin that holds it onto the underwater valve.


 
 
 

Step 4: Locate the Piston

Unscrew the cap end of the valve case and pull out the piston. The washer is at the end of the piston.


 
 
 

Step 3: Replace

Replace the washer, put the piston back in and screw the cap on. Replace the float arm and split pin. Replace the cistern lid and turn the water supply back on.


 
 
  Limitation of Liability
This project has been produced to provide basic information and our experienced staff are available either in-store, or via phone or email, to answer any questions you may have. As this information is generalised Mitre 10 is not responsible for the application of the principles in any particular case, as the contents of this project may need to be modified for the particular site and circumstances. Consumers should always ensure that they comply with any local body bylaws that pertain to any construction project and consult a qualified tradesperson where expert services are required.
 
 

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