Retro Smeg dishwasher, do we need a spare part?

15 Feb 2021
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United Kingdom
Hi there!

We have just got a used Smeg retro dishwasher and can see on the inside there is a circular hole with grey trim . On the right side this leads to the air break softener I presume. There is a plug in that side.
On the left inside there is a very similar circular hole with grey trim that looks like it is screwed on. There is no plug in this side.
I can't gather is this is normal or of we missing a part?
There are two similar circular holes on the interior roof with no plug.

Any help appreciated!

Thank you
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