For hooking your marine-style 30- or 50-Amp RV power inlet to a standard power source. Threaded locking ring helps to create a weatherproof connection.POWERGRIP LOCKING ADAPTER (CAMCO)SKU: 14717555524$53.29PriceQuantity*Add to CartFeaturesDescription50A Fem Locking/50A Male Std PowergripLength18"