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This protective cover has been helping to stop false fire alarms around the world for more than 35 years, without restricting legitimate alarms. All models offer excellent protection against physical damage (both accidental and intentional) and several against severe environments both inside and out. It is ideal for schools, colleges, hospitals, nursing homes, stores, hotels and public buildings of almost every kind where there is a threat of false alarms.
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STI-1100 Stopper II® Indoor Use Pull Station Protective Cover

STI-1100 Stopper II® Indoor Use Pull Station Protective Cover
STI-1130 Stopper II® Indoor Use Pull Station Protective Cover

STI-1130 Stopper II® Indoor Use Pull Station Protective Cover
STI-1200 Stopper® I Indoor Use Pull Station Protective Cover

STI-1200 Stopper II® Indoor Use Pull Station Protective Cover
STI-1230 Stopper II® Indoor Use Pull Station Protective Cover

STI-1230 Stopper II® Indoor Use Pull Station Protective Cover
STI-1150 Weather Stopper® Indoor/Outdoor Use Pull Station Protective Cover

STI-1150 Weather Stopper® Indoor/Outdoor Use Pull Station Protective Cover
Description N/A This protective cover has been helping to stop false fire alarms around the world for more than 35 years, without restricting legitimate alarms. All models offer excellent protection against physical damage (both accidental and intentional) and several against severe environments both inside and out. It is ideal for schools, colleges, hospitals, nursing homes, stores, hotels and public buildings of almost every kind where there is a threat of false alarms.
Model Type N/A With horn for flush mount for Indoor Use N/A With horn and spacer for Indoor Use N/A Without horn flush mount for Indoor Use N/A Without horn with spacer for Indoor Use N/A Stopper II® with horn flush mount, Gaskets (Indoor/Outdoor Rated)
Note for Model Type N/A Add NR for no label on horn housing
Add CR for custom label on horn housing
Operating Temperature N/A -40 to 121 ºC-40 to 250 ºF
Power Source N/A 9 Volts (V) DC Alkaline Battery included on Standard Stopper II®
Flush Width N/A 7.2 in183 mm
Flush Height N/A 10.2 in259 mm
Flush Depth N/A 3.3 in84 mm
Surface Width N/A 7.2 in183 mm
Surface Height N/A 10.2 in259 mm
Surface Depth N/A 5.5 in140 mm
Warranty1 N/A 3 y
How It Works N/A Stopper II® consists of a clear, tamperproof, tough polycarbonate shield and frame, but the line includes models with the option of a piezo horn, spacer, Form “C” dry relay contact and gaskets. The cover accommodates most manual pull stations. When the Stopper II® with horn is lifted to gain access to the protected alarm, a piercing self-contained 95 or 105 dB warning horn (at one foot) 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 drops off of the frame and a horn will sound (models with horn) until the cover is snapped back onto the frame or for the life of the battery.
General Information N/A
  • Proven effective for more than 35 years in helping stop false fire alarms without restricting legitimate alarms.
  • Can be used as a guard against physical damage to a manual pull station, with or without the optional warning horn.
  • Protect devices such as EPOs, call boxes, telephones and emergency shutdowns by changing the color and messaging.
Design N/A
  • Larger sizes and surface mounted pull stations accommodated with STI-3100 conduit spacer.
  • Weather models have closed cell gaskets.
  • The Stopper II® design is a registered trademark of Safety Technology International, Inc.
Installation N/A
  • When covering a pull station outside, UL requires stations to be listed for outdoor use.
  • Typical working properties of polycarbonate are -40 º to 250 ºF (-40 º to 121 ºC).
Electronics N/A
  • Power source is a 9 V DC alkaline battery included on standard Stopper II® (remote powered unit available).
  • "RC" models include one Form "C" dry relay contact and are capable of operating from 9-24 V DC remote power or 9 V DC battery power.
Options N/A
  • Optional horn has a choice of 95 or 105 dB at one foot.
  • Standard red units have "In Case of Fire…" label unless specified with "no label" or "custom label" (extra charge for custom label).
  • Horn housing is available in red, blue, green or yellow with optional custom labeling.
Testing N/A It has been tested and approved or listed by:
  • UL, cUL Listed No. S2466
  • For fire alarm applications, UL38 requires outdoor listed stations for outdoor use
  • Factory Mutual No. OG6A2.AY (STI-1100 and STI-1130 only)
  • State of California (Obtain local fire marshal approval)
  • MEA 49-00-E (STI-1200)
  • Flush models ADA Compliant. Surface models ADA Compliant for operation (UL Certified No. S2466)
  • Weather Stopper® versions designed to meet the requirements of IP54.
  • The indoor/outdoor rated station covers, when mounted on a smooth surface, provide a rain tight seal similar to a 3R enclosure rating.
Accessories N/A STI-3100 - 2 in. conduit spacer with 1/2 in. conduit entry (no gaskets included)
STI-3104 - 2 in. conduit spacer with 3/4 in. conduit entry (includes one 3/4 in. conduit entry gasket)
STI-1102 - Replacement horn for cover with alarm
STI-1280 - Backplate for Stopper II® and Weather Stopper® series
Important Notice N/A Stopper II® "FIRE" models are intended to be used in areas where the incidence of false fire alarms from manual pull stations is high or has proven to be a serious problem. Any disadvantage of this device is more than balanced when one considers the consequences of false fire alarms, especially if fire service personnel and equipment are responding to a false fire alarm when they are needed for a real fire somewhere else. Add to this the disruption to the facility when false alarms occur. If you have, or may have, a problem with false fire alarms or physical/weather damage to your fire alarm activation devices, the Stopper II® could prove invaluable.
Warning N/A For RC models: UL Listing does not permit relay contacts to connect to the fire alarm or a life safety function. The power supply for horns, according to UL Listing, cannot be connected to a UL Listed fire alarm system. For electrical specifications see install book. RC models contain one set of Form "C" dry contacts. Contacts rated 30 V AC/V DC 1 amp.
  • 1 Three year guarantee against breakage of polycarbonate in normal use (one year on electromechanical and electronic components).