Curt Manufacturing 57187 4 to 5 Way Flat Electrical Adapter for Boat Trailer Surge Brakes

Easily connect a 4‑flat vehicle plug to a 5‑flat trailer plug, perfect for boat trailers with surge brakes.

🔧 Key Features:

• 🔌 Converts a 4‑way flat vehicle socket to a 5‑flat trailer plug

• 💡 Adds a fifth wire for reverse lights

• 🛠️ Requires simple splicing for proper installation

• 🧱 Durable molded plastic construction — resists corrosion and wear

• ⚓ Designed specifically for boat trailers with surge brakes