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Model 2178-E is designed to fit most raised trigger latch couplers. This model was manufactures with a larger rear mouth area in order to accommodate the raised latch area. This lock model will be able to accommodate most S style safety chains.
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. In addition, no other trailer coupler locks can secure your safety chains.