PN#57261  SKU#927  Adapter (7 Way RV Blade To 6 Way Round Trailer, Center Pin Auxiliary. Product: Electrical Adapter. Material: Plastic. Adapts a 7-way RV blade vehicle socket to fit 6-way round trailer plugs. Simple plug-and-play design eliminates the need for cutting or splicing. 6-way connects tail, brake, turn signals, electric brakes and auxiliary power.