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Not every power source you'll plug into has a 30-amp RV outlet, and this adapter bridges that gap. It converts a 15-amp male household-style plug to a 30-amp female RV connection, so you can shore up from a standard wall outlet when that's all you have.
Running a 30-amp RV off a 15-amp circuit limits how much you can draw at once, so plan accordingly if you're running multiple appliances.