STI Stopper II® / Weather Stop...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$122.37
STI Stopper II® / Weather Stopper® Cover – Red Horn Housing, Indoor/Outdoor, Optional Horn & Spacer

STI Stopper II® / Weather Stopper® Cover – Red Horn Housing, Indoor/Outdoor, Optional Horn & Spacer

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Model: STI-1150
$122.37

In Stock (leaves warehouse same day if ordered before 3pm ET)

$122.37
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STI Stopper II® / Weather Stopper® Cover – Red Horn Housing, Indoor/Outdoor, Optional Horn & Spacer

The STI Stopper II® and Weather Stopper® Indoor/Outdoor Protective Covers are designed to safeguard fire alarm devices and other emergency units from vandalism, dust, weather, and accidental activation. Each cover features a durable red horn housing, with configurations available in flush mount or spacer mount styles. Models may include an integrated 95 dB horn, and optional clear spacers allow compatibility with surface-mounted devices. Label variations include Custom Label, No Fire Label, or standard lens. These covers are suitable for both indoor and outdoor use, offering long-lasting protection in harsh environments while maintaining accessibility and visibility for emergency equipment.

Key Features

  • Weatherproof design with IP54-rated gasket for use in outdoor or exposed locations
  • Optional internal horn provides a 95 dB or 105 dB warning sound when the cover is lifted
  • Available in flush or surface mount versions, with spacer kits for deeper devices
  • Operates in extreme temperatures ranging from –40°F to 250°F (–40°C to 121°C)
  • ADA compliant for both flush and surface installations
  • Includes long-life 9V DC alkaline battery in horn-equipped models
  • UL/cUL listed (S2466) and MEA approved
  • Constructed from tough, clear polycarbonate to withstand impacts and environmental wear

Manufacturer Resources

VIEW SPEC SHEETS

Product Specs

Certifications:
ADA Compliant, UL/cUL Listed, MEA Approved
Horn Option:
Optional 95 dB or 105 dB Piezo Horn
Label Options:
Standard, NR (No Label), CR (Custom Label)
Optional Accessories:
Spacer kits, gaskets, conduit spacers, backplates, replacement horns
Outdoor:
Outdoor Use (Weather Resistant)
Spacer Depth Addition:
2 inches (approx. 50 mm)
Warranty:
3 Years (Polycarbonate), 1 Year (Electronics)
IP Rating:
IP54 (Gasketed Models)
Product Line:
STI Weather Stopper II with Gaskets
Operating Temperature:
-40°F to 250°F (-40°C to 121°C)
Battery Type:
9V DC Alkaline (included with horn models)
Product Group:
Safety
Product Subgroup:
Protective Covers
Product Type:
Stopper II® / Weather Stopper® Cover – Red Horn Housing, Indoor/Outdoor, Optional Horn & Spacer
Department:
Safety
Product Color:
Clear with Red Label (or optional NR
Product Dimension:
7.2" W x 10.2" H x 5.5" D (Surface Mount),7.2" W x 10.2" H x 3.3" D (Flush Mount)
Installation Options:
Flush or Surface Mount
Product Material:
Polycarbonate

Parts & Accessories

    Safety Technology International STI-1150 – Frequently Asked Questions

    1) Do I need the horn version of the STI Stopper II, or is the plain cover enough?
    The horn version is what stops nuisance pulls. Lift the lid and an internal piezo horn sounds at 95 dB or 105 dB, which draws attention to whoever opened it without putting the building's fire alarm into alarm. That is the one to spec in schools, dormitories, hospitals and any public corridor where false pulls are the actual problem. The Without Horn Flush Mount version is a straight physical shield: it keeps dust, weather, forklifts and carts off the device but makes no sound. Horn models ship with the 9V DC alkaline battery included.
    2) Will an STI Stopper II cover over a manual pull station still meet ADA reach requirements?
    Yes, the Stopper II and Weather Stopper covers are ADA compliant in both the flush and the surface mount configurations, so adding one over a pull station does not put the opening out of compliance. Along with that they are UL/cUL Listed and MEA approved, which is what a facility engineer or an AHJ in New York City will want on the submittal.
    3) Will an STI Stopper II horn cover work over an emergency stop button or door release, not just a fire pull?
    Yes, and that is what the NR (no label) option exists for. Ordering the cover without the fire label means it can go over an emergency stop, a door release button, a nurse call or a thermostat without implying the device inside is a fire alarm pull. If you want the device identified, the CR custom label option takes two lines of your own text. The housing is clear polycarbonate, so the device and its own markings stay readable through the cover.
    4) Does putting an STI Stopper II cover over a pull station stop people from being able to pull the alarm?
    No. The cover lifts, it does not lock the device out. The polycarbonate lid swings clear so the pull station or emergency device underneath stays fully reachable, and on horn-equipped models lifting the lid sounds a 95 dB or 105 dB alert that flags the attempt. That is the whole design intent: keep accidental knocks, dust, weather and casual vandalism off the device while leaving it available in a real emergency, and stay ADA compliant in both flush and surface mount.
    How fast can I get the Safety Technology International STI-1150 delivered?
    Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
    Can I return it if it doesn’t work for me?
    Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
    Does the Safety Technology International STI-1150 come with a warranty?
    Absolutely. The Safety Technology International STI-1150 is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
    How do I get technical support or installation help for the Safety Technology International STI-1150?
    You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
    Why buy the Safety Technology International STI-1150 from ZenSupply?
    ZenSupply makes it easy to get the commercial door hardware you need—fast shipping, expert support, and rewards on every order. Our team is always ready to help you choose the right product for your project.
    !