Master Lock Coupler Lock

The Coupler Lock 3784DAT features a 2-5/16in (59mm) heavy duty trailer coupler lock, made from laminated steel construction. The advanced locking mechanism provides resistance to picking and prying. The keyway cover offers additional protection from moisture and dirt. The Limited Lifetime Warranty provides peace of mind from a brand you can trust. Click here to learn more.

Master Lock is recognized around the world as the authentic, enduring name in padlocks and security products. Since their founding in 1921, they have worked hard to earn and maintain the trust of customers by delivering on their promise of strength and quality and by continually setting new standards for lock design, application and performance. As the largest global manufacturer and marketer of padlocks, they continue to build on their founder’s passion for innovation, quality, and compelling value into our expanding lines of security solutions.