Trying to identify the control unit in the picture, the clear panel on this one is loose (brackets broken) and I would like to replace, but would prefer to update if possible with a newer model.
The 240 volt socket is made by Clipsall, an Australian company. They should be readily available at electrical wholesalers. They make a huge number of different colours for them and also a large range of accessories. The plates are made of polycarbonate, regarded as unbreakable and widely used in caravans.
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