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View and download user manuals, installation instructions and other technical documents in PDF format. Click SEARCH FILES below, and select search criteria to display a list of  available information. We also offer a wide array of accessories designed to enhance and customize our wide products, making it easy to turn any project into a complete operating system. From level sensors and control panels to anchoring systems, grade level manways and engineering services, Highland Tank can help take your next project from concept to completion.