anyone had anything to do with primus 2 way 40 litre fridge??

Your most important consideration is how far below ambient temperature will this go - it should be indicated in the brochure that comes with the fridge. If you do a lot of outback travelling or want to use the fridge in your campsite I'd set a lower limit of 40 degrees below ambient if you want to use it as a freezer. Anything less and your food could be defrosting inside the unit on a hot summers day

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Ian