Toilet Fill Valve Hissing

[chris moore]

Hi all,
I need some advice please. I heard a hissing sound as my toilet was refilling and it was taking much longer than usual. When I took the top off I could see that small 'jets' of water were squirting out of the fill valve.
The jets are coming out of the bit that attaches to the valve (I've circled in red on the pic).
The toilet was fitted when we moved in and the fittings are behind a tiled wall.
My questions are what would I need to fix this and can I do it without having to take the tiles off behind the toilet.
NB the toilet has no fixings that I can access from underneath.
I've attached a couple of pics to help explain
Many thanks in advance
Chris

 

[Amateur]

Turn the water off and then unscrew the first plastic nut behind the red circles. You need one of these - Arctic Products Siamp Diaphragm Washer

Double check the diaphragm before you buy the part but the inlet looks identical to mine.

Nice easy fix. Ive replaced my own a couple of times over the years. The rubber diaphragm splits allowing a tiny jet of water to pass through causing the "hissing" you described and the slow refill. You will see the split when you remove it.

Just make sure you take a few pics so you can reassemble correctly. Make sure the tab on the diaphragm is aligned before you screw the nut back on and that the white plastic fork end is located properly on the grey rod.

It will all make sense once you start doing it.

Cheers.

 

[chris moore]

Thanks buddy, I'm passing screwfix later so I'll pick one up and let you know how it goes.
Much appreciated and the video helps too.
Chris

 

[chris moore]

Hello again,
I just wanted to say a big thank you. Your advice was perfect. I bought the part this afternoon and followed your instruction to fit it this evening. I was quite pleased with myself when it worked as I'm a total amateur and would probably have ended up spending £50+ on a call out + part! ... all in all I owe you a big thank you and a virtual beer (as I doubt you drink in my local
Thanks again
Chris

 

[Amateur]

Well done Chris, its always satisfying when you do a job for the first time and it all goes well.

I replaced two in four years in the last house so at least you will have have the confidence now to tackle it next time it splits.

Cheers