ProTool 4-Wire to 7-Wire Trailer RV Plug Adapter Converter Must-have accessory for boat, trailer and RV towing Converts 7-way RV blade-type plugs to 4-wire flat - no cutting, splicing or plug changes needed Heavy-duty ABS housing with non-rusting aluminum contacts; excellent quality, made in Taiwan Sold individually, keep one in every tow vehicle; 3-3/4"L x 1-5/8" diameter, 3 oz