What is this toilet part called?

[dontfollowme]

https://photos.app.goo.gl/KfR2FwFxMf1xvyZw8?

I have a toilet that is constantly running, it is a top flush and I reckon if I swap the part out that seems to be causing the issue it should fix it.

What do I need to be looking for?

Thanks

[jas xjr]

I think it is called a siphon

[CorradoTDI]

You have a bottom entry fill valve and a flush valve in that pic...

[RJG46]

We had a similar system and problem. It was usually something to do with the position of the cable between the flush and mechanism. Make sure it isn't getting in the way of anything and check for any kinks.

[dontfollowme]

I can't see anything resembling a cable but will have another look.

[ianrb]

Those depend on a silicon washer at the base to seal them, which sometimes fails. If you know the exact make and model you can get a repalcement for a couple of quit.

[Venom]

Looks like you've got a bottom entry inlet valve (the smaller thing on the left) and outlet valve (the larger cylinder in the centre) combined as one unit. Not seen one like that myself (usually they're seperate bits, in my limited diyer experience).

The constant running will likely either be:

inlet valve isn't shutting off properly, meaning the toilet keeps refilling and is overflowing.
outlet valve isn't ceiling properly, meaning the toilet never truly gets full for the inlet valve to shut off.

Difficult to know which problem you have without seeing it. If you keep the lid off try to see if the water level overflows the top of the larger circular outlet in the middle of the pic (or overflows into holes cut in the sides filling it from the middle). If it does either of those two things, the inlet isn't shutting properly. Could just be the rubber diaphragm needs replacing, or the float is catching somewhere stopping it from rising sufficiently to shut the valve.

If it never gets that full, more likely the outlet isn't shutting properly, which could be the rubber seal has failed, or there's just some grot stuck somewhere. If it were me, I'd isolate the water supply, drain the cistern, then look at taking everything apart, cleaning and reassembling to see if that cures it. If any rubber gaskets look knackered, replace as you go.

If you're not confident with that though, more plumbers could have that fixed within an hour.

[RJG46]

ianrb said:

Those depend on a silicon washer at the base to seal them, which sometimes fails. If you know the exact make and model you can get a repalcement for a couple of quit.

Yes. One went on ours. Black rubber ring on ours.

[dontfollowme]

Thanks for the further replies.

At it's worst it keeps filling until it eventually flows over the top of the white cylinder. The part that sprays the water out (about the site of a 5p in diameter) can be unscrewed. This part seems to be leaking.

At present I can just hear a gentle trickling into the bowl which is the water slowly over flowing into the white cylinder.

I may well just call a plumber when time allows.

[Bobhon]

The blue coloured float that is at the top of your picture, furthest on the right hand side, should be on a threaded rod, the white one.

Try screwing the float down lower. This will make the inlet valve close at a lower level, ie before it overflows into the outlet.

[dontfollowme]

Thanks for the last suggestion - it is on a threaded rod so I adjusted the float. The water level just rose over it!

Case in point: https://photos.app.goo.gl/ER1GTD3gAQs51rgP8

[dontfollowme]

If I am replacing the part does this do I need to replace the whole assembly? E.g from the inlet whole upwards?

[miniman]

dontfollowme said:

Thanks for the last suggestion - it is on a threaded rod so I adjusted the float. The water level just rose over it!

Case in point: https://photos.app.goo.gl/ER1GTD3gAQs51rgP8

The float you adjusted - are you sure it's not rubbing on the side of the cistern?

[dontfollowme]

Possibly but even when I hold the float in place this does not stop the tank from filling.

[Bobhon]

dontfollowme said:

Possibly but even when I hold the float in place this does not stop the tank from filling.

Sounds like a knackered fill valve then. Not expensive and not difficult to change. The ones from the diy sheds would probably come with instructions.

You Tube probably has loads of 'how to' videos on it that you could watch and become an instant expert

[stevensdrs]

You could unscrew the plastic nut at the top of the inlet assembly and see if there is a sealing washer you can replace. Otherwise a new inlet assembly is about £12 and the whole flush system is about £20.