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Safety Technology International Stopper II with Horn Flush Mount, Fire Label

Safety Technology International Stopper II with Horn Flush Mount, Fire Label

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Model: STI-1100
$122.08

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

$122.08
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STI Stopper II® Protective Cover – Red Horn Housing, Optional Horn & Spacer

The Stopper II® Indoor/Outdoor Protective Cover series with optional horn and spacer configurations is engineered to protect life safety devices from vandalism, dust, and accidental activation. Available in flush-mount or spacer-mount options, each unit features a rugged red horn housing with optional clear spacers for surface applications. Variants include models with or without an internal 95 dB horn and offer customization options such as Custom Label, No Fire Label, or “A” Backbox with Special Gasket and Plate assemblies for enhanced weather sealing and device compatibility. Designed for ease of installation and maximum protection, Stopper II covers meet the demands of both commercial and industrial environments.

Key Features

  • False Alarm Prevention: Safeguards against accidental or prank activations without impeding legitimate use.
  • Physical Protection: Hard polycarbonate shell guards pull stations, enhancing durability—even outdoors
  • Optional Alarm Horn: Models with an internal piezo horn generate 95 dB or 105 dB when lifted, alerting security or staff.
  • Outdoor Rated Models: Weather-resistant with IP54-rated gaskets for outdoor installations.
  • ADA Compliance: Both flush‑mount and surface models meet ADA standards.
  • UV & Temperature Resilience: Polycarbonate withstands –40 °F to 250 °F (–40 °C to 121 °C).
  • Battery: Includes a 9 V DC alkaline battery; remote-powered versions available.

Product Specs

Product Line:
Stopper II
Alarm Type:
Audible
Sound Emission:
105 dB
Device Compatibility:
Fire Alarm, Pull Station, Telephone
Product Group:
Safety
Product Subgroup:
Stopper Devices
Product Type:
Stopper II with Horn Flush Mount, Fire Label
Department:
Safety

Parts & Accessories

Parts & Accessories Diagram

    Safety Technology International STI-1100 – Frequently Asked Questions

    1) Will an STI Stopper II cover fit over the fire alarm pull station I already have on the wall?
    The Stopper II protective cover is made to go over fire alarm pull stations, and also over telephones and similar life safety devices. It comes in a flush mount version that sits directly against the wall for recessed or semi-flush stations, and a spacer version that adds depth for surface mounted stations and surface conduit. Measure how far your station stands off the wall: if it is surface mounted, order a spacer configuration, not the flush mount.
    2) What is the difference between the Stopper II with horn and the one without a horn?
    The horn versions have an internal piezo sounder that goes off when someone lifts the cover, so a prank pull gets attention before anyone touches the station. The no-horn versions are a plain polycarbonate shield: they stop dust, accidental bumps and casual vandalism, but lifting the cover is silent. Pick the horn version for corridors, schools, dorms and public areas where false pulls are the problem. Pick the no-horn version where you only need physical protection, or where a local sounder would confuse people about a real alarm.
    3) Can I get a Stopper II cover without the FIRE label on it, or with my own wording?
    Three label choices on the Stopper II: the standard fire label, no fire label at all, or a custom label where you supply up to two lines of text. Use the no-label version when the cover is protecting something that is not a fire device, since a FIRE marking over an emergency phone or a call point misdirects people in an emergency. Custom text is what facilities use for wording like a department name or a local instruction.
    4) Can an STI Stopper II be used outside or in an unheated area?
    Yes, the Stopper II series is rated indoor and outdoor. The polycarbonate shell holds up from -40 F to 250 F (-40 C to 121 C) and resists UV, so it will not chalk or go brittle on a loading dock or an exterior stairwell. For wet or windblown locations add the weather gasket. In cold climates where condensation or icing inside the cover is a concern, STI offers a 12-volt and a 24-volt heater kit that mount inside.
    5) Does putting a cover over a pull station violate ADA?
    No. Both the flush mount and the surface mount Stopper II covers meet ADA standards, so a covered pull station stays within reach and operable requirements. The cover lifts out of the way, it does not add a second operation the user has to figure out, which is the part that usually trips up ADA on protective enclosures.
    6) Will a Stopper II cover stop someone from actually pulling the alarm in a real fire?
    No, and it is not meant to. The cover lifts to expose the station underneath, so a legitimate pull still happens in one motion with no tool and no key. What it changes is intent: on the horn models the 105 dB sounder fires the moment the cover goes up, so a casual or prank pull draws staff attention immediately. Protection against false alarms, not against use.
    7) How loud is the Stopper II horn?
    105 dB from the internal piezo sounder when the cover is lifted. That is loud enough to carry down a corridor and be heard over normal building noise, which is the whole point: the person lifting the cover knows they have been noticed, and staff nearby hear it. It is a local sounder only, it does not signal the fire panel.
    8) How is the Stopper II powered, and can I run it off building power instead of a battery?
    The horn models run on a 9-volt DC alkaline battery that ships with the cover, so a standard install needs no wiring at all. That is what makes them practical to retrofit onto existing pull stations in an occupied building. STI also makes remote-powered versions if you would rather feed it from a building supply and not manage battery changes across a large site.
    9) What gaskets do I need to weather seal a Stopper II on an exterior wall?
    Three gaskets cover the usual exterior cases: the STI-3002 weather gasket for the cover itself, the STI-3003 conduit gasket where flexible conduit enters, and the STI-3004 rigid conduit gasket for rigid conduit runs. STI rates the outdoor gasket arrangement to IP54, so it handles dust and splashing water. Match the gasket to how the conduit actually lands at the box, not to the cover.
    10) If the horn on my Stopper II stops working, do I have to replace the whole cover?
    No. The horn is a serviceable module, and the STI 1102 replacement horn kit drops into an existing Stopper II housing. For a property manager running dozens of these across a portfolio, that means a dead sounder is a parts swap on a ladder, not a re-order and re-mount of the cover.
    11) Can I mount a Stopper II where there is no electrical box or the wall surface is uneven?
    Use the STI-1280 backplate, which fits the Stopper II and Weather Stopper series. It gives a flat, solid mounting surface on block, brick or irregular walls where the cover's own frame would not seat cleanly, and it spreads the fixing load instead of relying on the box.
    How fast can I get the Safety Technology International STI-1100 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-1100 come with a warranty?
    Absolutely. The Safety Technology International STI-1100 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-1100?
    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-1100 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.
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