STI Stopper II® with Horn Flush Mount (Indoor/Outdoor Rated), No Label (view 2)
STI Stopper II® with Horn Flush Mount (Indoor/Outdoor Rated), No Label (view 2)
STI Stopper II® with Horn Flush Mount (Indoor/Outdoor Rated), No Label
Product images are provided for reference and may not represent the exact model, configuration, or included components.

No Bots, Just Experts

Questions about this product? Free pre-sales support from a senior specialist — product questions, compatibility checks, BOM quotes, price confirmation — typically answered within one business day. Need camera placement or system design work? Engineering time is $175 per hour (qty 1 = 1 hour). Hardware buyers get up to one hour ($175) credited back on their order.

Get Free Pre-Sales Support Buy Design Hours ($175/hr)
Description

STI STI-1150NR Horn Flush Mount Pull Station Guard

Overview

The STI-1150NR Stopper II is a protective cover designed to deter false fire alarms and prevent physical damage to manual pull stations. Its robust polycarbonate construction, coupled with an optional piezo horn, offers a proven defense against accidental or intentional tampering. This model is specifically suited for flush-mounted pull stations in environments where both indoor and outdoor protection is required, including schools, hospitals, and public buildings. The STI-1150NR includes a 9VDC power source, making it ready for immediate deployment.

Compatibility

This unit is designed to cover most manual pull stations. It accommodates standard flush-mount configurations. For surface-mounted pull stations, the STI-3100 conduit spacer can be used to ensure proper fit.

Installation Notes

The STI-1150NR is rated IP54 for outdoor use, offering protection against dust and splashing water. Polycarbonate construction provides a wide operating temperature range, typically from -40°F to 250°F (-40°C to 121°C). The unit requires a 9V DC power source, which is included with standard models.

What's in the Box

  • 1x STI-1150NR Stopper II with Horn
  • 1x 9V DC Alkaline Battery
Expert Analysis
Specifications
Product Type: Lock/Strike
Strike Type: Horn Flush Mount
Voltage: 9VDC
Type: Lock/Strike
Mount Type: Flush Mount
Environment Rating: Outdoor
Warranty: Manufacturer Warranty
Package Contents: d on standard
Ip Rating: IP54
Q&A
Reviews
Product Video

STI 1150NR Flush Mount

$140.30
$139.99
Add to Cart

RELATED PRODUCTS

Save $0.31
STI Stopper II® with Horn Flush Mount (Indoor/Outdoor Rated), Fire ... (view 3)
Add to Cart The item has been added

STI STI-1150

STI 1150 Flush Mount

Flush-mount 9VDC electric strike with horn for fire-rated doors

  • Integrated horn provides audible feedback during door strike actuation
  • Indoor/outdoor rated design works in standard and fire-rated door frames
  • 9VDC operation integrates directly with access control panel relay outputs
Usually Ships in 2-3 Weeks Free shipping over $499
$140.30 $139.99 Save $0.31
Add to Cart
The item has been added Add to quote
$140.30 $139.99 Save $0.31
Save $0.31 Add to cart Add to quote
Save $0.66
STI Stopper II® with Horn Flush Mount Custom Label - STI-1100CR
Add to Cart The item has been added

STI STI-1100CR

STI 1100CR Flush Mount

Flush-mount protective cover for manual fire alarm pull stations, sized to accommodate pull stations from 5-1/2" to 6-3/4" in width and height

  • Flush-mounts directly over pull stations up to 5-1/2" W × 6-3/4" H; no spacer needed.
  • Integrated 9VDC horn deters unauthorized activation attempts before an alarm triggers.
  • Clear window preserves visual inspection access; UL-listed and ADA-compliant.
Usually Ships in 2-3 Weeks Free shipping over $499
$142.65 $141.99 Save $0.66
Add to Cart
The item has been added Add to quote
$142.65 $141.99 Save $0.66
Save $0.66 Add to cart Add to quote
Save $0.45
STI Universal Stopper - Flush Mount with Sounder, ACTIVATE FIRE ALA... (view 3)
Add to Cart The item has been added

STI STI-13020FR

STI 13020FR Flush Mount Stopper

Flush-mount fire alarm stopper with integrated sounder, 24VDC

  • 24VDC operation integrates with standard fire alarm and access control systems
  • Integrated sounder delivers audio notification at point of egress control
  • Flush-mount design fits discrete installation in door frame applications
Usually Ships in 2-3 Weeks Free shipping over $499
$133.44 $132.99 Save $0.45
Add to Cart
The item has been added Add to quote
$133.44 $132.99 Save $0.45
Save $0.45 Add to cart Add to quote
Save $294.59
STI Stopper II® Contractor 6-Pack with Horn Flush - STI-1100CP6
Add to Cart The item has been added

STI STI-1100CP6

STI 6-Pack Flush Mount Horn - STI-1100CP6

6-unit contractor pack of Stopper II protective covers designed to reduce false fire alarm activations at manual pull stations without blocking

  • 95 or 105 dB field-selectable horn triggers instantly on cover lift, alerting staff.
  • UV-stabilized polycarbonate rated –40°C to 116°C suits harsh or uncontrolled environments.
  • 6-unit contractor pack fits virtually all lever-operated pull stations without modification.
Usually Ships in 2-3 Weeks Free shipping over $499
$751.58 $456.99 Save $294.59
Add to Cart
The item has been added Add to quote
$751.58 $456.99 Save $294.59
Save $294.59 Add to cart Add to quote
Save $0.69
STI STI-13010FR Universal Stopper Flush Mount Intercom
Add to Cart The item has been added

STI STI-13010FR

STI STI-13010FR Universal Stopper Flush Mount Intercom

Passive 24VDC flush-mount intercom for mixed-vendor access control

  • Passive interface integrates with existing systems without amplifier conflicts
  • Flush-mount design installs recessed into door frames for clean profile
  • 24VDC operation connects directly to standard access control power circuits
Usually Ships in 2-3 Weeks Free shipping over $499
$67.68 $66.99 Save $0.69
Add to Cart
The item has been added Add to quote
$67.68 $66.99 Save $0.69
Save $0.69 Add to cart Add to quote

Looking for more STI products? Shop the full STI catalog →

System Design, Deployment & Technical Support

Support services and planning resources for commercial surveillance, access control, and infrastructure deployments.

Fixed scope • Fixed price

System Design Assistance

  • Get help validating product compatibility
  • Coverage requirements
  • Storage planning and deployment architecture before you buy.
Request Design Help

Deployment & Configuration Support

  • Access fixed-scope support for rollout planning
  • User setup guidance
  • Migration and system standardization across single-site or multi-site deployments
View Support Services

Guides, Tools & Calculators

  • PoE requirements
  • Storage retention
  • Camera selection and deployment methodology
Open Technical Resources
!