Toilet valve problem
Author
Discussion

LH.

Original Poster:

2,752 posts

235 months

Sunday 6th July 2025
quotequote all
Got problems with the toilet valve thingy biggrin only just stopping the water before overflowing have adjusted the float all the way down.

suspect requires a new one any ideas what the valve is called or even better any part numbers and is it easy to change ?



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tr7v8

7,521 posts

249 months

Sunday 6th July 2025
quotequote all
You need one of these.

https://www.screwfix.com/p/thomas-dudley-ltd-hydro...

Bottom fill valve. Easy to change, get a reel of PTFE tape when you get it.
Obviously turn the water off to the feed first or if no ball valve then either mains water or water tank.

LH.

Original Poster:

2,752 posts

235 months

Sunday 6th July 2025
quotequote all
tr7v8 said:
You need one of these.

https://www.screwfix.com/p/thomas-dudley-ltd-hydro...

Bottom fill valve. Easy to change, get a reel of PTFE tape when you get it.
Obviously turn the water off to the feed first or if no ball valve then either mains water or water tank.
Thanks appreciated.

Pica-Pica

15,853 posts

105 months

Sunday 6th July 2025
quotequote all
As said, very easy to fix. If the cistern overflows, it will only overflow into the pan anyway.

LordLoveLength

2,267 posts

151 months

Monday 7th July 2025
quotequote all
You shouldn’t need any ptfe tape if you dig out the existing fibre washer from the pipe connector and replace it with a new one!

Actual

1,527 posts

127 months

Monday 7th July 2025
quotequote all
LH. said:
Got problems with the toilet valve thingy biggrin only just stopping the water before overflowing have adjusted the float all the way down.

suspect requires a new one any ideas what the valve is called or even better any part numbers and is it easy to change ?
Your fill valve looks pristine and brand new. It should be possible to get it working correctly and avoid having to turn off the water then empty the water and get the old valve out and fit a new valve and have the faff of getting a spanner under the cistern and not getting a good watertight seal after 3 tries to tighten up.

If you disassemble the top part and replace any washer and fit back together it might then work OK.

ade73

465 posts

130 months

Monday 7th July 2025
quotequote all
One of these on the water inlet, slow the flow down a bit.

Had a similar problem with a new toilet and this sorted it.

https://www.screwfix.com/p/flomasta-isolating-valves-15mm-2-pack/65251

eps

6,769 posts

290 months

Monday 7th July 2025
quotequote all
Are you in a hard water area? I would check the top of the valve to see if there's any grit or limescale in there causing an issue. These things are usually fairly robust but a small bit of something can cause havoc or possibly a split membrane... The rest of it is fairly simple and usually problem free.

LH.

Original Poster:

2,752 posts

235 months

Monday 7th July 2025
quotequote all
Thanks everyone for the help.

not in a hard water area will pop the top of and have a look.