Towing Equipment› Trailer Wiring and Electronics

Custer Products Inc

4 WAY ROUND TO 4 FLAT ADAPTER ABS

$30.78

SKU: C022 ADP001

Special Order
Special Order
Ships in 4–6 weeks
Free Shipping
Non-Returnable Item
INSTALL DIFFICULTY
DIY PRO SHOP

Beginner — under 30 min

Description

The Custer Products Inc ADP001 is a trailer wiring adapter designed to connect a vehicle with a 4-way round socket to a trailer with a 4-way flat plug. This adapter maintains the essential lighting functions, including running, turn, and brake lights, ensuring your trailer remains visible and operational.

Featuring a simple plug-and-lead setup, it eliminates the need for cutting or splicing wires. The adapter is built to fit traditional 4-way round receptacles, with three larger pins and one smaller ground pin, providing a snug and reliable connection.

Fitment

Fitment Guaranteed

Don’t gamble
on fit.

Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.

Available on iOS & Android

Specifications

BrandCuster Products Inc
Part NumberC022 ADP001

Buy with Confidence

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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