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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.
The STI-3150CR is a clear polycarbonate protective enclosure designed to guard manual fire pull stations against accidental and intentional false activations while permitting legitimate emergency access. Operating at 9VDC when a horn is added (standard units are battery-powered; see Compatibility), this unit includes a custom-label faceplate and integral spacer for frame mounting. The closed-cell gasket design handles outdoor exposure without degrading seal performance—critical for sites where pull stations face rain, temperature swings (-40°F to 250°F), and UV exposure. Unlike simple guards that slow response time, the Stopper II mechanism is designed to maintain rapid legitimate alarm triggering while raising the friction cost of false pulls.
The STI-3150CR fits standard manual pull station openings and accommodates larger or surface-mounted stations when paired with the optional STI-3100 conduit spacer (included in this SKU). The 9VDC specification applies only to models equipped with the piezo horn option; standard battery-powered units do not require external voltage. Verify your pull station geometry and frame depth before ordering—the spacer is fixed, not adjustable. If your installation uses a remote-powered horn variant, confirm 9VDC availability from your existing panel or UPS system; no step-down transformer is needed.
When covering an outdoor pull station, UL requires the station itself to be listed for outdoor use—the cover does not upgrade an indoor-rated station to outdoor duty. Mount the spacer flush to the frame and verify gasket compression around all edges to maintain weather resistance. The polycarbonate is rated for normal use (no deliberate impact testing); avoid mounting directly where it faces routine bumping or vibration. Ensure 9VDC power runs on a dedicated circuit if the horn is activated by the same control panel as the alarm—horn draw can spike during pull events.
Manufacturer-verified compatible cameras, recorders, mounts, accessories, and licenses for this product. Adjust quantities and add the entire bundle to your cart in one click.
Polycarbonate protective enclosure for manual fire pull stations designed to block accidental or intentional false activations while preserving
Flush mount 9VDC strike with weather sealing for exterior doors
Tamperproof polycarbonate guard that retrofits over break-glass fire alarm call points to prevent accidental and malicious false alarms
Fire-labeled spacer component for the Stopper II door strike family
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