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Not every site or garage outlet gives you 50-amp shore power, so it pays to keep an adapter like this in your cord bag. It steps a 15-amp male plug down to a 50-amp female connector, so your RV's power cord can hook into a regular household-style outlet when that's all you've got.
Handy as a backup for campgrounds with limited hookups, or for running your RV off a garage outlet at home.