Pollak 12-742 7-Way Heavy-Duty Round Pin to 4-Way Flat Trailer Adapter

The Pollak 12-742 is a rugged, professional-grade adapter designed for drivers who need to tow a standard light-duty trailer with a vehicle equipped for heavy-duty service. This compact tool instantly converts a 7-pole heavy-duty round pin socket (commercial style) into a standard 4-way flat connector, allowing you to power the essential lighting on utility trailers, boat trailers, and cargo haulers.

Built for the Professional Hauler Manufactured by Pollak, the industry leader in heavy-duty electrical components, the 12-742 is built to endure. The housing is constructed from high-impact, glass-filled nylon, making it completely non-corrosive and resistant to the harsh chemicals, road salt, and moisture found in commercial environments.

Reliable Plug-and-Play Performance There is no need for time-consuming rewiring or permanent vehicle modifications. The 12-742 features a full-length shell design that ensures a positive, secure latch into your truck's 7-way round socket. Once connected, it provides seamless electrical flow for your trailer’s tail lights, turn signals, and brake lights.

Key Features & Benefits:

• Instant Conversion: Connects a 4-Way Flat trailer plug to a 7-Way Heavy-Duty Round Pin vehicle socket.

• Non-Corrosive Housing: Glass-filled nylon shell is impact-resistant and won’t rust or pit like metal adapters.

• Standard Circuitry: Supports all basic lighting functions including Tail, Stop, and Turn signals.

• Compact & Portable: Small enough to store in your glovebox or tool tray for on-the-go versatility.

• Secure Fit: Designed with a retention notch to stay firmly seated in the vehicle-side socket during transit.

Specifications:

• Manufacturer: Pollak (by SMP)

• Part Number: 12-742 (also replaces 12-742P)

• Input Side: 7-Pole Round Pin (Male / Commercial Style)

• Output Side: 4-Pole Flat (Female)

• Material: Heavy-Duty Glass-Filled Nylon

• Color: Black