Cistern Pan Hose Question

[techweb]

I have a pneumatic concealed cistern behind a removable vanity panel. I pulled the panel off to investigate a dull knocking noise when the cistern is coming to nearly full, I haven't ascertained what this might be as yet, I wondered if it was the cold water pipes knocking (as in water hammer) but this wasn't the case.

However, this is the first time I've had this vanity front off since living here for four years and I noticed the hose between the toilet and the pan is slightly on the wonk / angle and the connection to the pan looks like the attached photo.

This has been fine for over four years we've been here and it's been in place for ~13 years so I am not minded to mess with it but just wondered if this looks normal.

 

[JusKel]

If it has been like that for so long and not leaking then don't touch it. The seals will have formed to this shape and won't take kindly to being disturbed

 

[techweb]

If it has been like that for so long and not leaking then don't touch it. The seals will have formed to this shape and won't take kindly to being disturbed

That was my thoughts... Is it common for these hoses to be installed on the wonk? In an ideal world it would be square / lined up surely.

 

[techweb]

Here is the knocking sound captured on video.

 

[ShaunCorbs]

That’s water hammer either the inlet / fill valve is bouncing / or there’s a pipe rattling

 

[techweb]

That’s water hammer either the inlet / fill valve is bouncing / or there’s a pipe rattling

Thanks. The strange thing is, it doesn't happen all the time. Another flush right after and it's fine. It happens towards the end of the filling and I even have felt the copper pipe leading into the flexi hose and that is not seemingly vibrating.

 

[ShaunCorbs]

Would change the fill valve

 

[techweb]

Would change the fill valve

I will ask my plumber to that when he is here next... Presumably they aren't standard and it will be specific to my cistern?

 

[ShaunCorbs]

I will ask my plumber to that when he is here next... Presumably they aren't standard and it will be specific to my cistern?

Maybe a siamp but your plumber will be able to tell / sort it

 

[techweb]

Maybe a siamp but your plumber will be able to tell / sort it

Looks like a Grohe got in and took a picture.

More concerning though is it appears to also have dropped on side per the video. I'm surprised it was fixed with two screws and not with washers which presumably is the reason for it slipping on the left side. Again it's probably been like this for years so will let me plumber take a view on it. Disturbing it's position might lead to bigger problems but at the least an extra screw on the left might prevent it departing the wall and flooding.

Not sure who the plastic cistern is made by. Couldn't see any markings.

 

[Ben-gee]

I would add a washered screw (or flange headed) to the top of each slotted hole before trying to change the fill valve.

It’s one of those : either do the least possible so as not to disturb anything from its current position ( eg flush pipe seals, pan connector);
Or - take cistern right out and refit with new internals and new seals everywhere.
A decision best taken on site.

 

[techweb]

I would add a washered screw (or flange headed) to the top of each slotted hole before trying to change the fill valve.

It’s one of those : either do the least possible so as not to disturb anything from its current position ( eg flush pipe seals, pan connector);
Or - take cistern right out and refit with new internals and new seals everywhere.
A decision best taken on site.

Thanks... I certainly wouldn't want to move anything if keeping the existing setup. I am considering, just replacing the whole lot excluding the pan given it's age. Probably overkill but gives piece of mind and hopefully many more years trouble free operation.