Loo/se sink tap

How do I get access to tighten loose sink tap on my Duetto

Can you get to it through outside fridge vent?

Thanks will try tomorrow

If you can see the bottom of the sink from below then you may get away with the following. Screwfix do a box spanner kit, which with the aid of a mirror and torch may enable you to tighten up the flange nut for the tap. If such a wrench is not long enough, often they can be extended by using a suitably sized second wrench on the end of the first. That’s how I reached the tap on my Nuevo.