Thetford 365 seal/o ring

[Bev53]

Hi all. Have done a forum search but couldn’t spot anything. Emptying my 365 tank at a CL elsan point (manhole cover over main sewerage pipe). For some reason, before replacing the cap, I gave it a little shake………..& watched as the o ring flew out & down the 8’ drop

Looking for a replacement & the only option is a whole new cap complete with the seal which seems a tad ott (& pricey). A measure of the pipe indicates about a 60mm ring required so was thinking of eBay/going to a plumbing merchant & trying.

I surely can’t be the only numpty to have done this……can anyone advise on correct/best sizing for a replacement ring, if done this way, or does it have to be a new cap TIA

 

[Googlebot]

I would just go to a plumbers merchant too.

Alternatively, a neat bead of silicone would do the same job but probably wouldn’t last.

This would work too if you cut it down.

Solid Neoprene Rubber Washer Pick Your Own Size - Size; 2mm Thick - 8mm Inside Diameter x 60mm Outside Diameter
https://www.amazon.co.uk/dp/B07ZJWVTTH?tag=mhf04-21

 

[Bev53]

I would just go to a plumbers merchant too.

Alternatively, a neat bead of silicone would do the same job but probably wouldn’t last.

This would work too if you cut it down.

Solid Neoprene Rubber Washer Pick Your Own Size - Size; 2mm Thick - 8mm Inside Diameter x 60mm Outside Diameter
https://www.amazon.co.uk/dp/B07ZJWVTTH?tag=mhf04-21

Yeah, think it may be the best option. Not sure about the silicone……have to take that cap off every 4 days or so to empty…… Trial & error I guess

 

[Just smiffy]

My local hardware store sells big rolls of thickish rubber sheeting a metre wide and whatever you want long, I bought a meter and cut my own stuff from it, I’ve used it for washers and all sorts but I bought mainly to make washers for the toilet seat at home to stop it moving around… I would have sent you some but I’m away… try your own local shops…

 

[Bev53]

Just been into a local plumbing supplies……Explained the situation, showed him the cap & the guy looked completely baffled. Said they had nothing - although I had just been looking at trap seal kits in Wickes which had a washer only a couple of mil too big (probably 62 - 65 mil in size). Thanked him for his time & left

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[GeoffnDee]

Bev53 Have you tried www.leisurelines.net (CAK tanks) they show some cap O rings .