Note: If there is no isolation valve installed then now is an ideal time to install one. See our project on how to fit an isolation valve for help on how to do so. Once installed, the next problem a lot of people encounter is that, the first time they flush a newly fitted close coupled toilet cistern, it leaks. This is such a common problem and 99% of the time the answer is the same. The cistern needs to be fitted at exactly 90° to the toilet pan. This allows the large rubber ring washer, or doughnut to create a proper seal. Using a spanner if there are nuts present or your fingers if there are wingnuts, unscrew each nut and then carefully lift the cistern free of the toilet pan. To stop water running out of the cistern through these holes the fitting kit is supplied with 2 conical rubber washers. The thinnest end plugs down into the hole and as the bolts are done up, a metal washer on top crushes the rubber into the hole creating a firm seal.

To allow water in to fill the cistern, normally a flexi hose connector is attached to a water supply pipe and then screwed on to the base of the fill valve. In some instances a flexi hose isn’t used and copper pipe runs straight to the valve. Finally have a good clean up around the under side of the toilet and floor, removing any water that could cause make you think there are leaks but there aren’t and then flush the toilet. If all is well after any inspection all should be clear and you should now be leak free. With the water turned off you can now safely disconnect the supply pipe. Before you do so though, place some old towels under the area surrounding the pipe and an old tray of some type. There will spillage so you will need to catch it all.

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With the wall fixings removed the final job before removing the cistern is to loosen and remove the through bolts holding the cistern to the pan.

However this issue would not just become apparent after flushing the toilet, there would be a constant leak.

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We are currently using Royal Mail Parcelforce and DPD as our delivery providers, all small items will be delivered by Royal Mail, these can take up to three working days to reach you. I realise this is an old thread however my experience may be useful to others. I also had a siphon fault with toilet marked M360 from Ideal Standard made in late 1995. I believe the model name is Reflections or Meadow and it was designed as a 7 litre flush. This is especially important if the leak is with a newly installed close coupled toilet! The through bolts, as stated above, secure the cistern to the toilet by running down through holes in the base of the cistern and top of the toilet. When screwing up these bolts once they are inserted down through the toilet pan, if you don’t tighten them evenly and together so that the cistern is pulled down straight and level then this can also be a cause of leaks as the cistern will sit at an angle and not seal the doughnut correctly. Other Causes of Leaks From Close Coupled Toilets If you have ever seen an old and aged piece of rubber then you will know that it looses it’s flexibility and essentially dries out and becomes brittle. At this point it will have lost it’s ability to form a decent seal and will then start to leak.