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Mini Stopper II® without Horn with Spacer

This unique and patented device has helped stop false fire alarms around the world for over 30 years, without restricting legitimate alarms. With a custom label the STI-6545 is also ideal for access controls, digital keypads, smaller manual pull stations, shutdown switches in computer rooms, workshops and much more.

STI-6545 consists of a clear, tamperproof, super tough polycarbonate cover, frame and conduit spacer that is designed for surface mount manual pull stations (flush - see STI-6540). Additional models are available with a built-in warning horn that sounds when cover is lifted to gain access to the pull station (see STI- STI-6605). The STI-6545 offers excellent protection against physical damage (both accidental and intentional).


  • Cover is UV-stabilized.
  • Three year guarantee against breakage of polycarbonate in normal use.
  • Proven effective for more than two decades.
  • STI-6545 is for surface mount pull stations (Flush - see STI-6540).
  • UL Listed to U.S. and Canadian safety standards.
  • Typical working properties of polycarbonate are -40° to 250°F (-40° to 121°C).
  • Fits virtually all manual pull stations (see Technical Data Sheet for dimensions).
  • ADA Compliant.
  • Custom labeling available (incurs a fee).