How to replacing a dual flush valve?

Question

Our dual flash valve is broken and we have a replacement part but how do we swap it? Do we need to drain the cistern first as well as turn the water to the toilet off?

Peter · Accepted Answer

Hi Lou yep isolate water from cistern and flush as normal  you will be left with a small amount of water in bottom I usually use a sponge to soak up remainder if you can't flush normally I use a small hose to create a syphon 
If cistern is  a low level type remove flush  pipe and undo large lock nut pull out syphon to replace reverse of above
If close couple type cistern requires removing then same applies to remove syphon 
Hope this helps

Ash · Answer

It may turn and pull out, if it’s the same one and it’s on a basket, normally I do it with the water on as it doesn’t make a difference, but if it’s a different make you will have to change the basket as well, that means taking the cistern off. 
Hope this helps, ash

Gary · Answer

Hi

Yes you will have to drain the system tank,
Usually ther is isolation on the cold water inlet pipe ( the pipe that supplies water to the toilet )
Or you can turn off the mains coming in to the property.
There are two common types of toilet ,
A low level systern and is as simple as removing  the flush pipe this is the pipe of around 40mm in diameter that connects the the tank to the toilet pan and then the larger nut on the underside of the tank.
The other common style of toilet is close coupled.
On this style toilet there are two wing nuts on the underside of the toilet pan towards the back do not mistake the toilet seat fixings for the wing nuts that need to be removed ,
There are also usually two screws within the tank under the lid screwed directly in to the wall once these are removed the tank should just lift off to reveal the large nut remove that and your in business.
Don’t forget to remove all the water from the tank as flushing will not drain the tank fully ,
I use a wet vac however a small tub one then a sponge 🧽 will do just fine .
Good luck

Gavin · Answer

You have to turn the supply off to the toilet 
Flush it then remove the flexi tap connector remove the bolts from underneath the toilet cistern remove the cistern and the you can change the flush valve

Harrison · Answer

If the dual flush valve unclips from the base of the cistern and is like for like you don’t need to turn anything off just simply unclip and clip back in, with your new dual flush valve it should have the base of it in the box and you can work out how the mechanism works before doing it for real on your toilet, if it’s not like for like the whole toilet will need dismantling

Neil · Answer

Hi Lou, if it is the same make and model as what you have installed you may be able to twist the main part of the body out and insert the new one.
If this is not possible then the cistern needs to be isolated, drained and then removed to install the new syphon.

Majd · Answer

"Hi Lou yep isolate water from cistern and flush as normal you will be left with a small amount of water in bottom I usually use a sponge to soak up remainder if you can't flush normally I use a small hose to create a syphon 
If cistern is a low level type remove flush pipe and undo large lock nut pull out syphon to replace reverse of above
If close couple type cistern requires removing then same applies to remove syphon 
Hope this helps"

Brian · Answer

Its advisable to turn water off and drain cistern to replace valve...as long as accessible

Damon · Answer

Yes isolate the water drain the cistern detach it then swap out the part and refit and test

Craig · Answer

"If the dual flush valve unclips from the base of the cistern and is like for like you don’t need to turn anything off just simply unclip and clip back in, with your new dual flush valve it should have the base of it in the box and you can work out how the mechanism works before doing it for real on your toilet, if it’s not like for like the whole toilet will need dismantling"

How to replacing a dual flush valve?

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