CURT 57187 4-Way Flat Vehicle-Side to 5-Way Trailer Wiring Adapter

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Part #: 57187
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  • Adapts 4-way flat vehicle socket to fit 5-way flat trailer plugs
  • 5-way flat connects tail lights, brake lights, turn signals and reverse lights
  • Durable molded plastic housing resists corrosion
  • Some manual wiring required

  • Some manual wiring required

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There are several different types of connectors used to supply power from a tow vehicle's electrical system to a trailer's wiring system. Some trailers only need the bare essentials -- running lights, brake lights and turn signals -- while others require a connection for reverse lights, electric brakes and auxiliary power. With connectors ranging from simple to complex, it may be the case that the connection between your vehicle and your trailer is not a perfect match. For example, your truck may be equipped with a 6-way round socket, but your trailer may have a 4-way flat plug. For this very common problem, CURT offers a quick and simple solution in the form of an electrical adapter. An adapter is an electrical device that allows a connection to be made between a mismatched trailer plug and vehicle socket. It easily plugs in your vehicle's electrical socket and usually requires no additional wiring. CURT offers an array of adapters to accommodate most types of plugs and sockets, including 4-way flat, 4-way round, 5-way flat, 6-way round, 7-way RV blades and more. This electrical adapter is designed to adapt a 4-way flat vehicle socket to fit a 5-way flat trailer plug. It 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.

BrandCURT Mfg
Length6.75 inch(es)
Width3 inch(es)
Height1.38 inch(es)
Weight.2 lb(s)
WARNING CA Proposition 65Yes
WARNING CA Proposition 65 Message<! Triangle> 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
WARNING: Some products may contain chemicals such as DEHP, which can cause cancer, birth defects or other reproductive harm. For more info go to
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