STI 13520NG Universal Stopper Dome Cover, Enclosed Back Box and Opened Mounting Plate, Label Hood with Horn, Green

Protect life-safety and access-control devices with the STI 13520NG Universal Stopper protective cover from Safety Technology International. Designed for commercial and institutional security applications, this rugged polycarbonate enclosure shields pull stations, keypads, intercoms and emergency buttons from vandalism, weather and accidental activation while preserving visibility for monitoring and surveillance.

The Universal Stopper combines a waterproof NEMA 3RX rating and UV-stabilized construction with a built-in 105 dB alarm to deter tampering and alert staff or security teams. Its low-profile, ADA-compliant profile (5.95" H x 4" W x 2.18" D) fits most standard pull stations, and the enclosed back box with an open mounting plate simplifies surface-mount installation and wiring. Ideal for schools, healthcare, transit and manufacturing sites that require reliable protection for safety devices, the STI-13520NG reduces false alarms and service interruptions while supporting emergency monitoring and response protocols.

Specify the STI 13520NG to harden your security infrastructure—order now or contact our sales team for volume pricing and application guidance.

• Guards critical devices (pull stations, keypads, emergency buttons) from vandalism and accidental damage while maintaining clear visibility
• Integrated 105 dB audible alarm provides immediate deterrence and supports faster security monitoring and response
• NEMA Type 3RX, UV-stabilized polycarbonate construction delivers weatherproof, long-lasting protection for indoor/outdoor installations
• Low-profile, ADA-compliant design (<4" depth) fits most pull stations and preserves accessibility
• Enclosed back box with open mounting plate streamlines surface-mount wiring and reduces installation time
• Rugged continuous hinge and included gaskets minimize maintenance and downtime; backed by a 3-year limited warranty