Cistern Doughnut probelm

[topgazza]

So Im just finishing and fitting the cistern onto the close coupled pan and water leaks out when flushing. So I remove the cistern and the doughnut looks Ok but maybe a bit easy to push in the hole. So I have another doughnut but its much thicker and bigger. It seals the hole OK but the cistern wont sit flush on the pan so its clearly the wrong size and too thick to compress enough. Original has a hex nut cutout and is a 1/4 to 1/2 inch thiner than the new one.

It worked before so in theory the old doughnut is OK and was the one that came with the toilet. It looks and feels fine but I'm not confident about finding the right one now. I could put plumbers gold sealant around the hole and see if that works. Any tips on getting the right one though ?

 

[nortonj]

So you have re used an old donut?
Once its been used you cant put it back on

 

[topgazza]

I think I got away with it last time. But yes, new doughnut required. To be fair its in perfect nick...to look at.

Outside diameter of the old one is 82mm and a 44mm hole but it has got a hex cutout for the syphon nut which seem hard to find

 

[nortonj]

Its probably just moulded to the shape of the hex nut.
To get your new donut to compress more so the cistern sits down on the pan just push down on the cistern as you tighten.

 

[topgazza]

Ive tried that but the replacement is just too wide and doesn't want to play. Its 100mm wide compared to the 82 mm that was in there. Shouldn't make any difference I know but just doesn't want to compress and I just end up bending the metal plate that the bolts sit in. It feels like the same material but is much firmer

I'm wondering if foam is a better option than rubber

 

[gigz]

Get a universal donut from your local plumbers merchant.

 

[topgazza]

I'll do that thanks.

Problem with the old one is that it is being pushed inside the flush hole and not sealing. The spare came with the plate and new screws in a kit when I replaced the cistern flush a while back. But it's not 1.5 inch so just wrong. But off to my local merchant tonight

 

[gigz]

There's a few different shapes/materials/sizes its just a case of getting the nearest fit.

 

[topgazza]

Oh yes......

Looking at a 1 1/2 inch foam doughnut with outside diameter of 90 mm to make sure it sits on the hole properly. I'm sure rubber is fine but I don't think my cistern likes them. Probably the design of course. But given the spare rubber one should have fitted but just wouldn't compress but on checking was the same thickness as the old, foam is worth a try. Might try a correct size rubber one just for interests sake but yes.... quite a choice

 

[topgazza]

Having a mare trying to locate a donut that is suitable. Its a 1 1/2" as stated before and need to be at least 90mm to cover the hole and the usual 20mm thick. Lots of 2" ones available and even the likes of Plumbase or Plumbcentre don't seem to carry much of a range. As above I was looking at a 1 1/2 x 90mm foam one but can't find it now. And pointers appreciated

 

[Madrab]

These guys are great, seem to do them all

http://www.plumbers-mate-sales.co.uk/close-coupled-kits-doughnuts-and-flush-pipes-80-c.asp

 

[topgazza]

That's more like it. Decent range. Thanks Madrab