The Camco Power Grip RV Power Cord Adapter plug # CAM55223 referenced in your question can technically work with up to 30 amps. As long as the connectors mate up properly, you will be able to connect this plug to a 20 amp receptacle without issue.
With that being said, I recommend verifying that this will work for your application, as there are several different connector types depending on the amp rating, so it's very possible that you would not be able to plug this into a 20 amp outlet... view full answer...
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