- New
TC123 (Trimax) is an adjustable trailer coupler lock designed to help protect a parked trailer against unauthorized hookup. Its adjustable locking head fits couplers with spans of 7/8, 2-1/2 and 3-1/2 inches, offering compatibility with a wide range of trailer couplers. The lock features a hardened steel construction with a triple-plated chrome finish for corrosion resistance. Its locking head is designed to resist false locking and forced opening. Two keys are included. Confirm the coupler's dimensions before purchase.