STI 6540 Mini Stopper II without Horn Flush Mount








This unique and patented device has helped stop false fire alarms around the world for over 30 years, without restricting legitimate alarms.

STI-6540 consists of a clear, tamperproof, super tough polycarbonate cover and frame that fits over manual pull stations. Additional models are available with a built-in warning horn that sounds when cover is lifted to gain access to the pull station (STI 6600). The STI-6540 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-6540 is for flush mount pull stations (surface - STI 6545 ).
  • 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.
  • Model: STI 6540
  • 22 Units in Stock
  • Manufactured by: STI Safety Technology Int'l

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