Swelled lip seal

[leggings]

My toilet seal has seemed to have swelled and I can’t get it to close. Has anyone else experienced this or am I doing something wrong?

 

[Gingernuts]

If the cassette is empty! Spray or rub some olive oil on it

 

[scotjimland]

just age or perhaps wrong chemicals or lubricant has been used...

replace the lip seal .. easy job, and only lubricate with silicone spray

this is advice form Thetford

Silicone-based formula is safe on toilets and holding tank seals (petroleum based lubricants cause swelling and degradation of rubber seals)

Never use Vaseline.. it is a petroleum based product

 

[Pausim]

Has the seal come adrift? That might make it bulge. I would replace the seal, there are Youtube videos on how to do this and it looks fairly easy.

Edit.
ps WD40 and similar are known to damage plastics and rubber so avoid these and only use approved lubricants.

 

[Gromett]

There is a recess running all the way round the seal on some models. This can get full of "crap" pushing the top part upwards.

Clean it out thoroughly and you may not need to replace.

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[leggings]

Has the seal come adrift? That might make it bulge. I would replace the seal, there are Youtube videos on how to do this and it looks fairly easy.

Edit.
ps WD40 and similar are known to damage plastics and rubber so avoid these and only use approved lubricants.

Thanks everyone for your advice. I have taken the seal out but it still won’t close. Pausim may have the answer as I use WD40 to lubricate thinking it was silicone based. Will buy a new seal and use Thetfords lubricant.

 

[Gellyneck]

Thanks everyone for your advice. I have taken the seal out but it still won’t close. Pausim may have the answer as I use WD40 to lubricate thinking it was silicone based. Will buy a new seal and use Thetfords lubricant.

I just replaced the seal in our Thetford C260 with this https://www.amazon.co.uk/dp/B0B48X6YNX?tag=mhf04-21

If that's the model you've got I can confirm it's a good fit (always a worry as a compatible).

Useful video on how to do it here.

 

[AJM2]

An old thread but thought I’d post this

Thetford 30003ED Seal Lubricant Silicone Spray Aerosol - 200ml | hotukdeals

www.hotukdeals.com

 

[Lenny HB]

Been using olive oil or silicone spay for more than 40 years without any problems, don't waste your money.

 

[tezza-alli]

No need to waste money on expensive Thetford products. I use either a silicone spray or better still I have a large tin of silicone grease suitable for all plumbing seals. Will last for years, if not a life time if used for your loo only.

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[Dinosaur]

Stop using botox then your lips wont swell