Toilet cistern inlet valve

[Calculus]

The toilet is filling very slowly so time to replace the inlet valve. I haven't done this job before so would appreciate confirmation the part I am intending to buy from Screwfix is the right part.

Picture 1 shows the current (faulty) bottom-entry inlet valve on the right. Picture 2 is Screwfix's FluidMaster Bottom-Entry Brass Shank Fill Valve 1/2". This looks like a good visual match to the existing valve and should fit my cistern, which has a depth of about 12 inches. The only thing that makes me hesitate is the mention of '1/2"'. I'm not sure what this refers to. The external diameter of the plastic thread at the bottom (brass on the replacement) is 20mm.

Can someone confirm this is the right part?

 

[terryplumb]

Yes it is. The half inch refers to the BSP thread of the valve ,nothing to do with diameter

 

[Calculus]

Thanks Terryplumb. I'll get round to educating myself on 'BSP threads'!

 

[Rodders53]

All you need is a new inlet valve washer / diaphragm....

With the water OFF to the cistern
Unscrew the nut to the left of the grey adjuster for the float.
Remove old, fit a new one.
Screw back the nut and ensure its all assembled right.

Looks like a Siamp fill valve to me https://www.fixthebog.uk/siamp-comp...TeUJOkZ1USaLLcWPRnLzTQF42qQvT6iRoCXqYQAvD_BwE

The diaphragm is ... https://www.fixthebog.uk/1-x-siamp-...er-95-95l-99t-99b-99-duravit-laufen-34951307/



Screwfix sell an overpriced pattern part to fit.

 

[Calculus]

Thanks Rodders53. I've bought the new valve now but I'll attempt to repair the old one as per your instructions and keep it as a spare.