Dishwasher leak

Can't you source some other O-rings, based on the dimensions?

That's amazing. Well done for finding that. :)

Have you tried

A quick search didn't find 10x21x5.5mm o-rings, not sure if superglue and some cord would work?

SGI45E15GB/29

FD8801

I've spoken to a couple of o ring manufacturers, who offered to manufacture them for me, but unsurprisingly at considerable cost.

Why don't you think siliconing is possible? Obviously the right sort of ring is a better fix but for an "end of life" machine I would not rule out a bodge.

Do an Internet search for a local bearing and seal supply company, ring them with the measurement of the seal and see if they might be able to match it. If they can, they will be just pence each.

Looks similar to the one I needed to replace on a Miele of similar age - probably in a similar application where a solenoid valve connected to the water softener mixer tank. Part was about 4 Euro from ebay, but I was able to effect a temporary repair with some PTFE tape wound round the shaft of the valve to make it a tighter fit:

I don't think its too bad, considering the age of it. Most manufacturers only make a certain number of parts and ass the stocks go down, they either have to make more, which costs due to small batch numbers, or restrict them through price, in both cases the costs go up. For new belts for a tape deck they went from 50p to five pounds in 10 years, as they perish so keeping old stock was never an option as Sony told me, but they lasted well, so no issues. Brian

In my case, the temporary repair is PTFE tape wound round the outside of the O ring. I haven't worked out why the o ring shrank in the first place. There are four of them, and only one has shrunk.

The bodge seems to be working, so I've put the machine back in place and levelled it. I'll just see whether there is any water leaking in normal use.

I've taken the opportunity to drill a 2mm hole in the sump. That'll let small quantities of water drip out slowly but still stop it if there's a significant flood.

Asking around various o ring stockists, this is a specialist size. So, if I need one, I'll probably just have to pay the Bosch prices. There's a guy offering a set on ebay for the knock down price of only £11.

You can see the o rings in the picture captioned "Have a bucket ready ...."

But make sure you get them before Haslloween - delivers to EU

Could you just cut one from some suitable thickness rubber sheet?