This electrical adapter is designed to adapt a 4-way flat vehicle socket to fit a 5-way flat trailer plug. It is specifically intended for boat trailers with surge brakes, adding in a fifth wire for the reverse lights and allowing your vehicle's 4-way flat to easily plug into your boat trailer 5-way flat. This boat trailer wiring adapter features durable molded plastic construction and requires some splicing. All CURT wiring and electrical products come with a one-year limited warranty to give you the assurance you need to tow with confidence.
- Adapts 4-Way Flat Vehicle Socket To Fit 5-Way Flat Trailer Plugs
- 5-Way Flat Connects Tail Lights
- Brake Lights
- Turn Signals
- Durable Molded Plastic Housing Resists Corrosion
- Some Manual Wiring Required
| Attributes | |
| California Proposition 65 | Yes |
| Class ID | 11 |
| Country of Origin (Primary) | TW |
| Emission Code | Legal US |
| Finish - XA | N/A |
| GTIN | 00612314571871 |
| Harmonized Tariff Code (Schedule B) | 8302303060 |
| Hazardous Material Code | N |
| Item Class - XA | OBS |
| Item Height - XA | 0.000 |
| Item Length - XA | 0.000 |
| Item Width - XA | 0.000 |
| Life Cycle Status Code | Available to Order |
| NAFTA Preference Criterion Code | B |
| Parcel Allowed - XA | Yes |
| Product Weight - XA | 0.200 |
| Rate Class - XA | 70.0 |
| Retail Height - XA | 1.375 |
| Retail Length - XA | 6.750 |
| Retail Width - XA | 3.000 |
| SDR Required Flag | N |
| Shipping Weight - XA | 0.200 |
| Tariff 301 - XA | No |
| WARNING CA Proposition 65 | Yes |
| WARNING CA Proposition 65 Message | WARNING: This product can expose you to chemicals including Di(2-ethylhexyl) phthalate which is known to the State of California to cause cancer and Di-n-butyl phthalate which is known to the State of California to cause birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov |
| Warranty | One-Year Limited Warranty |
CURT 57187 4-Way to 5-Way Flat Adapter for Boat Trailer Surge Brakes
Product Information
- Brand: CURT
- Product Number: 57187
- Availability: 2 in stock

















