I've replaced the siphon valve on our loo. Whilst I was at it I also replaced the doughnut seal as well (as recommended). I put it all back together again but the blasted thing is leaking - not by much, its just a small drip which seems to come from the underside of cistern and rolls down the pipe connecting it to the pan, and thence onto the carpet.
So, I have a loo that flushes, but now it leaks a bit. Great :-(
Am not a DIY expert at all (treat me gently chaps), so I am all out of ideas. Having managed to sort out the main problem, am maddened by the niggling little leak that has popped up.
Are you totally sure that it's the doughnut that is leaking? As occasionally this can mask leaks from other places such as the bolts that go through the bottom of the cistern and secure it to the toilet or it may even be leaking from the syphon?
Occasionally you do get slight defaults in the cast itself meaning that washers etc.... do not form a complete seal and the disruption from replacing teh syphon may have brought this to light
You can use some Plumbers Mate to add to any seals as this will create an additional seal to help plug any gaps.
You can also use silicone but you will have to leave it to set before reassembling. Once the silicone has set you can then fill with water and check for any leaks and once you are sure there are none, you can put it all back together
When it comes to silicone, try to use a weather proof version as this will help in the long term and also aid in setting if surfaces are slightly damp
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