Cistern Coupling Rubber Doughnut Thingy .

[Stuart]

Having replaced my toilet pan with a new one that someone gave me on Freecycle and reused the rubber seal I had on the cistern ,now when I flush the cistern there is a little water comes from the seal area below the cistern and drips on to the floor . I had also ordered a replacement inlet valve and also a replacement cistern coupling kit .The replacement pan had some silicone around it's inlet so I have removed that but was wondering if the silicone is necessary to ensure a complete seal. Can anyone offer an opinion .?

Stuart

[Phil Anthropist]

Regarding the pipe that carries water from the cistern to the back of the toilet bowl, in my experience both ends need sealant to get a water-tight joint.

[Andrew Gabriel]

If this is a close-coupled system, then you need only a new Doughnut seal -- they rarely work when reused as they will have taken on a fixed shape in their previous life. No silicone required there.

I have sometimes had to use silicone where pipework goes through the cistern and the nuts/washers won't seal because the porcelain surface around the hole isn't flat/smooth.

[Roger Mills]

It's not a good idea to re-use the doughnut seals. They get deformed when fitted, and are unlikely to seal properly when re-fitted. They're fairly cheap to replace, and there's no need to use any sealant on a new one.

[Stuart]

Cheers Roger and Andrew ....

Ah ..That'll be the problem then..re-using the seal on the replacement pan.. The new one will be coming tomorrow so that should sort it .

thx again.

Stuart