STI 13420NG Universal Stopper Dome Cover, Enclosed Back Box and Sealed Mounting Plate, Label Hood with Horn, Green

Protect critical alarm and access-control devices from vandalism and false alarms with the Safety Technology International Universal Stopper (STI-13420NG) dome cover. This protective cover combines durable, UV‑stabilized polycarbonate construction and a sealed NEMA 3RX back box to shield pull stations, keypads, emergency buttons and duplex plugs from weather, impact and tampering without impeding legitimate use. When the dome is lifted the integrated 105 dB horn sounds locally, instantly drawing attention to the area and helping staff and security personnel respond faster — a practical deterrent for schools, hospitals, retail and other high‑traffic facilities. UL/cUL listing and a molded, high‑strength hinge ensure long-term reliability, while the compact 5.95 x 4 x 2.18 in profile and surface‑mount form factor make retrofits and new installs quick and cost efficient. Ideal for security, surveillance and monitoring applications where uptime and false-alarm reduction matter, the STI-13420NG delivers proven protection and audible notification in one unit. Specify the Universal Stopper for your next project or contact our sales team to discuss bulk or site-specific deployments.

• Prevents vandalism and accidental damage to pull stations, keypads and emergency buttons while preserving normal operation
• Built-in 105 dB audible horn draws immediate attention to deter tampering and reduce false alarms
• Rugged UV‑stabilized polycarbonate with NEMA 3RX sealed back box protects devices from weather and harsh environments
• Surface‑mount design and sealed mounting plate simplify installation and retrofit on most pull stations and entry systems
• ADA compliance and compact footprint (5.95" H x 4" W x 2.18" D) maintain accessibility and aesthetic integration in public spaces