RVGUARD
This is a repair or upgrade part for RV or campsite wiring, not a travel essential. If your existing outlets and fittings work, there is nothing to do.
RV owners repairing or adding power points.
RVGUARD 50 Amp 125/250 Volt RV/EV Power Outlet Box, NEMA 14-50R Receptacle (ASIN B083LFF2Q1). Amazon's page has the current price, specs and reviews.
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Check current Amazon listing (ASIN B083LFF2Q1).
Fine print: The Dude has not personally tested this product. The details on this page come from the Amazon listing and can change; check the listing for the current specs, price and availability.