Home / Retail Showroom / Trailer Electrical / Wiring Adapter, 4-Way Flat to 5-Way Wiring Adapter, 4-Way Flat to 5-Way Adapters for a quick switch from one style plug to another when towing multiple trailers. 51-20036 Categories: Retail Showroom, Trailer Electrical, Truck Electrical Product ID: 3557 Related products 1/2in-20 Plain Flanged Nut 12N Buy now CASTLE® HIGHWAY 95™ Buy now CASTLE® DOT 3 BRAKE FLUID Buy now 3 1/8in Shackle Strap 115208 Buy now