A coupler lock is a device used to secure the coupler of a trailer to a towing vehicle. It prevents unauthorized access and theft by locking the connection point, ensuring that the trailer remains attached to the vehicle when not in use. Coupler locks are commonly used with various types of trailers, including utility trailers, boat trailers, and car haulers. These locks come in different designs, such as hitch pin locks and latch locks, to fit various coupler styles. They are typically made from durable materials like steel to resist tampering and weather conditions. Using a coupler lock enhances security and provides peace of mind for trailer owners.