Changing washers now cistern won’t fill up

4 Feb 2020
Reaction score
United Kingdom

We woke to a leak caused by a cracked fibre washer.

I bought a pack of loads of different size of washers hoping one would be the right one as I was waiting for a spanner to arrive to actually open it up.

None were exact matches but one fitted but the fibre is slightly wider. Not an issue I thought.

I replaced it after cleaning the thread., which were already clean. Now it leaks after the isolation valve is turned back on and the tank does not fill up.

Returning the old washer in doesn’t fill up either when it used to.

Any ideas?

How can I make such an easy job a hard job.


Read more:


  • FE79FF4E-3C4A-484B-BE26-1F8284B85756.jpeg
    46.5 KB · Views: 184
  • DDB2E918-CC76-4F6E-A24A-C86E6FA32ED2.jpeg
    155.3 KB · Views: 174
  • 47CD7A36-5256-4398-B9CF-335243BD8F73.jpeg
    120 KB · Views: 196
  • 60B60861-428E-49BE-B782-A30E42FE5666.jpeg
    262.7 KB · Views: 197
  • 5BD50F89-B5B1-4339-AECE-4E4980F0D822.jpeg
    156.6 KB · Views: 175
  • 14BE09B7-5047-4F33-914A-D9D178D93330.jpeg
    154.6 KB · Views: 180
Sponsored Links
To start with you need a ½" tap connector washer as a rule they fit, Screwfix B&Q local plumbers if open.
There may be a filter in the connection you can pull out with pointed pliers, if not a bit of the old washer may have got into the valve is it a traditional ball valve or a later Flowmasta type one with a small float as part of the unit? Either way you may need to strip the valve.
Those connections are about the worst to get a good joint on because of the plastic thread you cannot get them really tight because the thread strips. they need to be spot on in line with the connection even the slightest angle will stop them seating, I always fit them to the cistern and then make the final connection to the pipework further back so they are not strained if I can.
Thanks for the good advice.

I’m not sure tbh as I haven’t been able to get the top off as I’m scared to break the buttons like the previous own has done upstairs.

it’s a Roca.


  • image.jpg
    144 KB · Views: 179
I’ve got the water going back into the toilet but just can not stop the weeping. Perseverance.


  • image.jpg
    201.5 KB · Views: 178
Sponsored Links
Depends how bad the weep is if just barely damp the washer may swell a bit with the water and take it up.

DIYnot Local

Staff member

If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.

Select the supplier or trade you require, enter your location to begin your search.

Are you a trade or supplier? You can create your listing free at DIYnot Local