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Floydy
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06-07-2018, 04:12 AM
1

Sealant for toilet cistern

I have just replaced the inlet mechanism for a toilet cistern because it had become worn at the base and was leaking water.
After tightening up the unit to the brass nut and olive underneath the cistern, then hand-tightening the white plastic washer the unit should have been watertight. But it wasn't. I was back at square one with a steady drip of water having to be collected in a container on the floor and tipped away at regular intervals.
You would think the black rubber washer between the base of the unit and the cistern would had sufficed, but after getting advice I was told that I should perhaps have used some sealant on the base also.

Has anyone done this task before and which is the best waterproof sealant to use?
Thanks
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06-07-2018, 07:15 AM
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Re: Sealant for toilet cistern

We use one this one: https://www.plumbingworld.co.uk/jet-...d-sealant-7474
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06-07-2018, 08:38 AM
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Re: Sealant for toilet cistern

Just half way through heaving the cystern off the toilet. I have three toilets here and none leak because I make sure the aperture is clean and put a smear of washing up liquid around the hole and the rubber to ensure a tight fit. No sealant needed.
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06-07-2018, 08:42 AM
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Re: Sealant for toilet cistern

You shouldn't need sealant as well as the rubber washer, but whenever I replace items in a cistern I smear a little Vaseline on the mating surfaces before re-assembly to ensure a good seal and never seem to have leakage problems, well not with the cistern anyway....
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06-07-2018, 09:44 AM
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Re: Sealant for toilet cistern

As mentioned Floydy, sealant shouldn't be necessary (or that's what the manufacturers say anyway) but real life is not the same. Any sanitary sealant will do but if you want the best go for Dow Corning.

This is what I would try first. If the internal conical washer looks ok and not distorted, I would loosen the plastic back nut and washer and insert sealant between the thread and the hole (from the outside) then re-tighten. This way the rubber washer will not become slippery and slide through the hole. Obviously you will need to drain everything from the cistern first. Everything needs to be dry too.

Good luck mate.
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06-07-2018, 02:30 PM
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Re: Sealant for toilet cistern

Looking at this again, I notice that I haven't placed a washer between the outside back plastic nut and the cistern - there wasn't one supplied. That may be the problem.
I'll take it all apart (when I get some time) and have another go. I may just put some sealant inside around the base of the inlet mechanism also.

Thanks very much for your advice and tips lads, much appreciated
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06-07-2018, 02:41 PM
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Re: Sealant for toilet cistern

Mastic.

Always used it when I installed toilets..basins
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06-07-2018, 06:34 PM
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Re: Sealant for toilet cistern

Originally Posted by Floydy ->
Looking at this again, I notice that I haven't placed a washer between the outside back plastic nut and the cistern - there wasn't one supplied. That may be the problem.
I'll take it all apart (when I get some time) and have another go. I may just put some sealant inside around the base of the inlet mechanism also.

Thanks very much for your advice and tips lads, much appreciated
I'm pretty sure that will be it Floydy. Is there one on the old one you can use?
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06-07-2018, 07:29 PM
9

Re: Sealant for toilet cistern

Originally Posted by Floydy ->
I have just replaced the inlet mechanism for a toilet cistern because it had become worn at the base and was leaking water.
After tightening up the unit to the brass nut and olive underneath the cistern, then hand-tightening the white plastic washer the unit should have been watertight.
The inlet was underneath??
Wickes shower and bathroom silicone sealant.
If it's threads you want to seal PTFE thread sealing tape might be the way to go,
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06-07-2018, 07:49 PM
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Re: Sealant for toilet cistern

Originally Posted by Besoeker ->
The inlet was underneath??
Wickes shower and bathroom silicone sealant.
If it's threads you want to seal PTFE thread sealing tape might be the way to go,
No, the brass nut and olive pipe is underneath.
 
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