Thermostat Guards, Fire Station Protectors, Safety Technology International (STI), and more!

STI-1130: Stopper II® with Horn and Spacer - Clear Spacer

$143.68 $100.99

NOTE the fire station shown in photo does NOT come with the STI-1130

Stopper II® with Horn and Spacer - Clear Spacer

This patented protective cover has helped stop false fire alarms around the world for over 30 years, without restricting legitimate alarms. Ideal for schools, hospitals, nursing homes, stores, hotels and public buildings of almost every kind.

STI-1130 consists of a clear, tamperproof, super tough polycarbonate cover, frame, spacer and piezo horn that fits over most manual pull stations. When lifted to gain access to the actual alarm, a piercing 95 or 105 dB warning horn sounds. Immediate attention is drawn to the area and a prankster will either run or be caught.

The cover is connected to the frame by a cable. When the cover is lifted, it hangs off of the frame and the horn will sound until the cover is snapped back onto the frame (or for the life of the battery).


  • Cover is UV-stabilized.

  • Three year guarantee against breakage of polycarbonate in normal use (one year on electro mechanical and electronic components).

  • 95 or 105 dB self-contained alarm. Complete with battery.

  • STI-1130 is for surface mount pull stations (flush - see STI-1100).

  • The Stopper II design is a registered trade mark of Safety Technology International, Inc.

  • UL Listed to U.S. and Canadian safety standards (for standard and custom labeling).

  • FM Approved.

  • 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).

  • Note: End user must verify the alarm and battery function every six months and replace battery annually or as required.