STI Stopper II with Horn Flush Mount STI-1100, Fire Label, Red
Lift the cover. Sound the horn.
The Stopper II STI-1100 is a red polycarbonate cover for fire alarm pull stations. Lifting it sounds a built-in horn, helping stop false alarms without restricting legitimate ones.

A bumped pull station means a false alarm.
False fire alarms disrupt schools, hospitals and public buildings. A protective cover that announces tampering helps deter them.
Deters false alarms, not real ones
The Stopper II adds a warning layer to a pull station without restricting legitimate use.
Horn on cover lift
When the cover is lifted, the self-contained 95/105 dB warning horn sounds to draw immediate attention.

years proven effective
The polycarbonate cover has been proven effective for over 40 years.
Legitimate alarms still work
The cover does not restrict legitimate alarms from being activated.
Polycarbonate protection
The protective polycarbonate cover has been proven effective for over 40 years.
Battery included
A 9VDC battery is included, and the horn is self-contained.
Everything you need to know.
| Brand | STI |
| Model | STI-1100 |
| Product Line | Stopper II |
| Alarm Type | Audible |
| Sound Emission | 105dB |
| Power Source | Battery |
| Material | PC |
| Color | Red |
| Height | 5.4" |
| Width | 5.0" |
| Depth | 5.2" |
| Certifications & Standards | UL/cUL FM ADA BSA |
STI Stopper II with Horn Flush Mount STI-1100, Fire Label, Red
The STI STI-1100 is a Stopper II with Horn Flush Mount (Fire Label, Red). It is made for fire alarm, security and facility professionals who need dependable protective cover equipment.
Key Features
- Protective polycarbonate cover proven effective for over 40 years
- Helps stop false fire alarms
- When cover is lifted, horn sounds
- Does not restrict legitimate alarms from being activated
- Self-contained 95/105 dB warning horn
- Includes 9VDC battery
- Warning horn draws immediate attention
- Flush mount
- 3 year guarantee, 1 year on electronics
- UL/CUL Listed, ADA Compliant
Specifications
- Brand: STI
- Model: STI-1100
- Product Line: Stopper II
- Product Model: STI-1100
- Product Series: STI-1100
- Product Type: Security Cover
- Alarm Type: Audible
- Device Supported: Fire Alarm, Pull Station, Telephone
- Material: Polycarbonate
- Application/Usage: Call Point, College, Hospital, Hotel, Indoor, Nursing Home, Outdoor, School
- Color: Red
- Color Details: Clear - Cover
- Depth: 5.2"
- Durability: Damage Resistant, Tamper Resistant
- Form Factor: Surface Mount
- Height: 5.4"
- Product Color: Clear
- Width: 5"
- Power Source: Battery
- Certifications & Standards: UL/cUL FM ADA BSA
- Features: Flush Mount, Protective UV-stabilised polycarbonate cover, The STI-1100 deters false alarms
- Shipping weight: 1.5 lb
Typical Uses
- Preventing false alarms and vandalism on fire and safety devices
- Schools, gyms, hospitals and public buildings
Please confirm that the STI-1100 matches your system, panel, mounting and finish requirements before ordering. Contact us with the model of your existing equipment if you need help checking compatibility.
Need help with compatibility?
Looking for a manufacturer part number, compatible replacement, or quantity order? Contact Raztechs for sourcing and quote support.

STI STI-1100, ready to order.
- 9VDC battery
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