Actually, this looks a better option - a 12V coolbox connector: 2m 12v Car Cooler Box Car Replacement Cable, Cigarette Power Cable Plug for Mini 240v Cool Box Fridge 1PCS https://www.amazon.co.uk/dp/B0BC8YYS6G?tag=mhf04-21
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The small plug may be reversible for pos and neg.
Though a heated butter dish shouldnt matter which is live.
But why a heated butter dish?
Just leave butter out of the fridge.
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