STI 13520NR Universal Stopper with Horn Enclosed Back Box Open Mounting Plate No Label Included

Protect critical access and alarm devices from vandalism, accidental triggers and the elements with the Safety Technology International STI 13520NR protective cover. This Universal Stopper security cover delivers robust, UV-stabilized polycarbonate protection while allowing normal operation of dual-action pull stations, keypads, intercoms, emergency buttons and light switches. The enclosed back box with open mounting plate secures wiring and simplifies surface or flush installation, and the unit supports a maximum 4-inch device protrusion for broad compatibility. An integrated horn option adds an audible deterrent to tampering—helping facility managers and monitoring teams detect and respond faster. Built for indoor and outdoor use in high-traffic, high-risk environments, this protective cover is ideal for fire equipment enclosures, access control points and surveillance/monitoring deployments. Choose dome or low-profile styles to match site aesthetics without sacrificing security. Order the STI-13520NR to harden your devices and reduce false alarms—contact us for volume pricing or integration advice.

• Prevents accidental or malicious activation while preserving legitimate access for pull stations, keypads, intercoms and emergency buttons
• Durable, UV-stabilized polycarbonate construction resists impact and weather for reliable indoor/outdoor protection
• Enclosed back box with open mounting plate simplifies installation and secures wiring for monitoring and fire equipment enclosure needs
• Integrated horn option provides an audible deterrent to tampering and enhances site security and surveillance response
• Low-profile or dome design fits a wide range of devices with a maximum 4" protrusion for versatile, universal coverage