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Double Cylinder with Security Indicator

The double cylinder, or dual cylinder, is available with or without security indication. The -2SI is ideal for visual verification in lockdown situations. 


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Designed for high use and abuse institutional environments, such as K-12 and higher educational campuses, the Von Duprin security indicators are recommended for the following applications: visual verification and lockdown. The visual verification application reduces the time to tour a facility and ensure that each door is secure with at-a-glance visual verification. The security indicators provide visual verification from inside the room and are ideal for high occupancy areas like auditoriums, cafeterias and gymnasiums.

The -2SI security indicator provides at-a-glance verification of the “LOCKED” and “UNLOCKED” door status from the inside of the room. Also available without security indicator, as -2. These options can be ordered as a new product or as a retrofit conversion kit for existing 98/99 Series exit devices.




  Higher Education

  • Lockdown solution that meets fire, life and safety codes for free egress
  • Security indicator with clear LOCKED/UNLOCKED icons and words behind tamper-resistant window (-2SI only)
  • Pad printed icons provide a clear direction of rotation to secure opening
  • Available for thumbturn or key cylinder
  • Modular conversion kits available for quickly upgrading existing devices
  • Available for 98/99 Series rim, mortise, surface vertical, concealed vertical rod and cable devices 
  • XP is only available for -2 devices. 
  • 98/9950WDC and associated fire-rated devices are not available with -2 or -2SI. 
  • Von Duprin devices with the -2 options maintain ANSI BHMA A156.3 Grade 1, UL305, and UL10C certifications.
  • The -2 is UL and cUL listed for use on panic exit hardware and fire exit hardware.
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Options & Accessories

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Did You Know?

Von Duprin has hundreds of possible configurations for any type of opening, giving you flexible and modular options.

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As part of Allegion’s family of pioneering brands, Von Duprin benefits from the strength, efficiencies, resources, and integration from a global power. In turn, we pass those advantages on to you.

Allegion helps keep people safe and secure where they live, work and visit. With more than 30 brands sold worldwide, we specialize in security around the doorway and beyond. It’s the power of one.

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