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TowSmart 4 Flat Trailer Wiring Extension

TowSmart 4 Flat Trailer Wiring Extension

TowSmart 4 Flat Trailer Wiring Extension is your simple, durable solution for extending your trailer’s lighting harness with ease. Designed for outdoor use, this extension leverage…

Towsmart MPN 2385
Sold Locally Only

This product isn’t sold on our website — see your local hardware store.

Typical Store Price i
Typical store price: low $7.99, average $9.99
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About Product Overview

TowSmart 4 Flat Trailer Wiring Extension is your simple, durable solution for extending your trailer’s lighting harness with ease. Designed for outdoor use, this extension leverages corrosion-resistant plastic housing to keep connections secure and protected from the elements, so you can tow with confidence in any weather.

Key benefits of the TowSmart 4 Flat Trailer Wiring Extension

  • Standard 4-flat connector: Compatible with the widely used 4-flat trailer wiring system for basic lighting and signaling, providing a straightforward, plug-and-play connection.
  • Corrosion-resistant plastic construction: Built to withstand road moisture, dirt, and outdoor exposure, reducing maintenance needs and extending usable life.
  • Lightweight and durable: Plastic housing keeps the extension easy to handle while maintaining solid protection against physical wear.
  • Retail-friendly packaging: Carded packaging for organized storage and easy in-store presentation, making it a convenient addition to any trailer kit.

Practical use cases

Whether you’re tackling a long-haul tow, repairing a damaged harness, or simply needing a little extra reach between your tow vehicle and trailer, this 4-flat extension helps keep your lighting system accessible without invasive rewiring. It’s especially handy for:

  • Seasonal trailers that are stored off-site and need a quick reconnection when in use
  • Boat, utility, and cargo trailers where routing the wiring is awkward or obstructed
  • DIY enthusiasts who value modular, easy-to-swap electrical components

Installation and care

Installation is designed to be user-friendly and non-invasive. Align the 4-flat connectors at each end, push firmly until you hear a click, and test each function—tail lights, turn signals, and hazards—before hitting the road. To maximize longevity, keep the connectors clean and dry when not in use, and avoid flexing the extension at sharp angles to prevent wear over time.

Who this extension is ideal for

TowSmart 4 Flat Trailer Wiring Extension is a practical upgrade for DIY trailer owners, fleet operators, and anyone who regularly connects trailers to vehicles with a standard 4-flat system. It’s a reliable accessory for those who value quick setup, straightforward maintenance, and durable performance in outdoor towing environments.

Product details

  • Product Type: Trailer Wiring Extension
  • Connector Type: 4 Flat
  • Material: Plastic
  • Packaging Type: Carded
  • Brand: TowSmart

The Details Specifications

Brand Towsmart
SKU 8138755
UPC 849278023850
Unit 0
Case Pack Quantity 6 per case
Retail Unit Quantity 1
Unit of Measure 0 0
Dimensions (L × W × H) 2 × 3 × 7
Weight 0 lbs
Cubic Feet 0.0368 ft³
Country of Origin INDIA
Safety Data Sheet (SDS) Manufacturer documentation · opens in new tab

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