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This blue/yellow hydraulic hand pump steel trailer lock system, installed at the loading dock, locks onto semi-trailer ICC bars with a 22,500 lbs/ft shear strength, featuring an accumulator to track trailer movement. It includes a beeper and flashing light for safety warnings if the lock fails to engage, plus a standard light package with a traffic light, control panel, and three large signs for visible status updates. Pre-drilled for easy setup, it ensures reliable, manual trailer security.