Model 2517-D was designed to fit Stamped Demco style trailer couplers. This style trailer coupler is usually found on heavy duty enclosed car trailers such as those used in show car transportation applications, Demco style trailer couplers will be found on enclosed car trailers, but in some cases trailer manufacturers offer Demco couplers on non-commercial trailers as an upgrade. If you have a Cast Demco Coupler please see Model 2517-D1

Designing the best coupler locks is not an easy task. We pride ourselves on producing a "glove like" fit coupler lock. Rest assured that Proven Industries trailer lock products will leave you with simply the best coupler lock on the market.

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