Gaplock PRO 12vdc. Automated Lock for Sectional Roll-up Overhead Doors, by Automated Security Technologies, Inc. Automatically Locks an Overhead Door Every Time It&rsquo;s Closed. Electronically Unlocked while Integrated 12vdc Solenoid Is Energized. Applicable on Commercial, Residential and Delivery Truck Overhead Doors, that are Not Connected to an Automated Opener or Garage Door Opener.