Some boat trailers have 5 Flat connectors on them to activate the surge brake. The 47515 4 Flat to 5 Flat adapter allows you to add the reverse wire to your existing 4 Flat that allows the surge brake to release.

• Retrofits existing 4 Wire Flat to a 5 Wire Flat
• For use with marine trailers equipped with surge brakes
• Weatherproof splice connections; bullet terminal and splice connector included
• Impact and corrosion resistant
• 90 Day Warranty From The Date Of Original Purchase