STI will be closed from December 24th – 26th and December 31st – January 2nd. Normal business hours will resume on January 5th, 2026.
DETAILS
This unique pull station cover has helped prevent false fire alarms around the world for more than 40 years, without restricting legitimate operation of devices. Ideal for schools, colleges, hospitals, nursing homes, hotels and all public buildings, the fire alarm cover helps stop false activation where there is a history or threat of misuse.
Key Features
DESIGN
DESIGN
- 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.
CONSTRUCTION
CONSTRUCTION
- Consists of a clear, tamperproof, tough polycarbonate shield and frame.
- UL Listed to U.S. and Canadian safety standards (also for custom labeling).
INSTALLATION
INSTALLATION
- When covering a pull station outside, UL requires stations to be listed for outdoor use.
- Typical working properties of polycarbonate are -40° to 250°F (-40° to 121°C).
ELECTRONICS
ELECTRONICS
- Power source is a 9V DC alkaline battery included on standard Stopper II.
OPTIONS
OPTIONS
- Optional horn has a choice of 95/105 dB at one foot.
- Standard red units have “In Case of Fire...” label unless specified with "NR" (no label) or "CR" (custom label).
OTHER FEATURES
OTHER FEATURES
- Proven effective for more than 40 years in helping stop false fire alarms without restricting legitimate alarms.
- Three year guarantee against breakage of polycarbonate in normal use (one year on electro mechanical and electronic components).
MEDIA
Product Models
STI-1100
Stopper II® with Horn Flush Mount, Fire LabelFeatures: 
Colors:
Dimensions:6.2 in H x 5 in W x 3.2 in D
STI-1100-ES
Stopper II® with Horn Flush Mount, Spanish LabelFeatures:
Colors:
Dimensions:6.2 in H x 5 in W x 3.2 in D
STI-1100-FR
Stopper II® with Horn Flush Mount, French LabelFeatures:
Colors:
Dimensions:6.2 in H x 5 in W x 3.2 in D
STI-1100CR
Stopper II® with Horn Flush Mount, Custom LabelFeatures:
Colors:
Dimensions:6.2 in H x 5 in W x 3.2 in D
STI-1100NR
Stopper II® with Horn Flush Mount, No LabelFeatures:
Colors:
Dimensions:6.2 in H x 5 in W x 3.2 in D
STI-1130
Stopper II® with Horn and Clear Spacer, Fire LabelFeatures:
Colors:
Dimensions:6.2 in H x 5 in W x 5.2 in D
STI-1130-ES
Stopper II® con Sirena y Espaciador Claro, EspañolFeatures:
Colors:
Dimensions:6.2 in H x 5 in W x 5.2 in D
STI-1130-FR
Stopper II® with Horn and Clear Spacer, French LabelFeatures:
Colors:
Dimensions:6.2 in H x 5 in W x 5.2 in D
STI-1130CR
Stopper II® with Horn and Clear Spacer - Custom LabelFeatures:
Colors:
Dimensions:6.2 in H x 5 in W x 5.2 in D
STI-1130NR
Stopper II® with Horn and Clear Spacer, No LabelFeatures:
Colors:
Dimensions:6.2 in H x 5 in W x 5.2 in D
STI-1130NR-FR
Stopper II® with Horn and Clear Spacer, No Label, FrenchFeatures:
Colors:
Dimensions:6.2 in H x 5 in W x 5.2 in D
STI-1200
Stopper II® without Horn Flush Mount, Fire LabelColors:
Dimensions:7 in H x 5 in W x 3.2 in D
