STI 13330NK Universal Stopper Enclosed Flush Mount Back Box with Horn and Relay, No Label Included, Black

Secure primary access points without compromising usability. The Safety Technology International STI 13330NK Universal Stopper protective cover delivers durable, visible protection for pull stations, keypads, intercoms and emergency buttons—reducing false activations and costly replacements while preserving legitimate operation. Molded from thick, UV-stabilized polycarbonate and rated NEMA Type 3RX, this enclosed flush back box shields devices and wiring from impact, dust, moisture and severe environments both indoors and out. Built-in horn and relay (operable from 12–24 VDC remote power) provide immediate audible notification and simple integration with existing security, surveillance and monitoring systems. High-strength continuous hinge and ADA-compliant design ensure reliable access and code compliance, while UL/cUL listing supports commercial installations. Ideal for schools, healthcare, transportation hubs and multi-tenant facilities that require vandal-resistant protection without sacrificing system performance. Add the STI 13330NK to your security infrastructure to safeguard life-safety and access control points—order now or contact us for application guidance and installation tips.

• Protects critical devices from vandalism and accidental damage while preserving normal operation
• Integrated horn and relay with 12–24 VDC remote power for audible alerts and seamless alarm system integration
• Enclosed flush back box safeguards wiring and simplifies installation in indoor/outdoor environments
• Rugged UV-stabilized polycarbonate construction and NEMA 3RX rating for long-term performance in harsh conditions
• Compliance-ready: UL/cUL listed and ADA compliant to meet commercial safety and accessibility requirements