Camco
A power cord, adapter or plug connects your RV to a campground pedestal, a generator or a home outlet. If your current cord reaches and has the right plug, you do not need another.
RV owners who plug into campground, generator or home power.
Camco PowerGrip Dogbone RV Electrical Adapter - Features Heavy-Duty 50-Amp Male and 30-Amp Female Connections - Crafted of 100% Copper 10/3-Gauge Wires & Rated for 125V/3750W (55175) (ASIN B000BUTDCA). Amazon's page has the current price, specs and reviews.
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Check current Amazon listing (ASIN B000BUTDCA).
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.