STI Stopper® Dome Series – Pro...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$49.66
STI-STOPPER-DOME-SERIES

STI Stopper® Dome Series – Protective Covers for Horns, Speakers, and Strobes

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Model: STI-1215

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

$49.66
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STI Stopper® Dome Series – Protective Covers for Horns, Speakers, and Strobes

The STI Stopper® Dome Series provides rugged, clear polycarbonate covers that protect horn/strobe units, speakers, and strobes from vandalism, accidental impact, and environmental damage. These virtually indestructible domes come in flush-mount, open back box, and enclosed back box designs. Stopper Dome covers maintain full visibility and accessibility of the protected device while preventing costly damage in schools, warehouses, public facilities, and outdoor installations.

Key Features

  • Protects horn/strobe units, speakers, and strobes from vandalism and accidental damage.
  • Made of clear, UV-stabilized polycarbonate for long-lasting durability.
  • Available in flush mount, open back box, and enclosed back box configurations.
  • Allows full visibility of protected devices while preventing tampering or breakage.
  • Withstands extreme temperatures: -40°F to 250°F (-40°C to 121°C).
  • Backed by a three-year guarantee against breakage in normal use.
  • Easy installation with included hardware and mounting options.

 

Manufacturer Resources

VIEW SPEC SHEET

Product Specs

Accessories:
Spacers, Gaskets, Mounting Hardware
Application:
Protects horns, strobes, and speakers from vandalism, tampering, and accidental damage
Certifications:
UL/cUL Listed (where applicable)
Device Compatibility:
Horn/Strobe, Speaker/Strobe, and Strobe-Only Units
Parent SKU:
STI-STOPPER-DOME-SERIES
Product Line:
STI Stopper® Dome Series
Warranty:
3-Year Guarantee Against Breakage in Normal Use
Operating Temperature:
-40°F to 250°F (-40°C to 121°C)
Product Group:
Safety
Product Subgroup:
Protective Covers
Product Type:
Stopper® Dome Series – Protective Covers for Horns, Speakers, and Strobes
Department:
Safety
Installation Options:
Flush Mount, Open Back Box, Enclosed Back Box
Product Material:
Clear UV-Stabilized Polycarbonate

Parts & Accessories

    Safety Technology International STI-1215 – Frequently Asked Questions

    1) Which mounting style should I pick for an STI Stopper Dome cover: flush mount, open back box, or enclosed back box?
    Pick by how the notification device is already installed. Flush mount is for a device mounted directly to a flush wall box or wall surface, with the dome sealing to the wall. The open back box is used when the device needs to stand off the wall or wiring runs behind it and you still want access. The enclosed back box is for surface conduit runs and outdoor or dirty locations where the device and wiring need to be fully boxed in. The Stopper Dome Series covers all three configurations.
    2) Will an STI Stopper Dome fit over a horn/strobe, or only a strobe?
    Both. The Stopper Dome Series is ordered in two device configurations, one for horn/speaker/strobe units and one for strobe-only units, and the covers are listed as compatible with horn/strobe, speaker/strobe, and strobe-only devices. Match the device type first, then the mount style.
    3) Does covering a fire alarm strobe with a Stopper Dome block the light or sound?
    The domes are clear polycarbonate and are built to keep the protected device fully visible and accessible, so the strobe lens stays readable through the cover. The covers carry UL/cUL Listing where applicable.
    4) Do the back boxes come with the Stopper Dome cover or are they ordered separately?
    The back box is part of how you configure the order. If you are building from parts, the STI-1212 is the open back box and the STI-1222 is the enclosed back box for the Stopper Dome Series. Mounting hardware, spacers, and gaskets are supplied with the cover.
    5) My notification appliance is on a single gang box. Is there an adapter for the STI dome?
    Yes, the STI-1284 single gang mounting adapter is made for the STI-1219 and STI-1229 domes and lets the cover land on a single gang box rather than a 4-inch square or surface box.
    6) We keep replacing horn/strobes that get hit by forklifts. Will a polycarbonate dome actually stop that?
    That is the case these covers are built for. The Stopper Dome is rugged polycarbonate meant to absorb accidental impact and vandalism on horn/strobe, speaker, and strobe units in schools, warehouses, and public buildings, and the manufacturer backs it against breakage in normal use. For high-traffic aisles, use it with the enclosed back box so the wiring and device are both protected.
    How fast can I get the Safety Technology International STI-1215 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-1215 come with a warranty?
    Absolutely. The Safety Technology International STI-1215 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-1215?
    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-1215 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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