Anaphylaxis Enclosures
Invacuation & Lockdown
Support Vital Lockdown Systems with Buttons & Covers
UL® Listed Products
Products tested and certified by Underwriters Laboratories®
Multipurpose activation, engineered to fit.
Build it your way. Choose your button type, colour, text, with or without cover.
Search for Products & Covers
Simply enter dimensions below to find a cover or cage to fit over your device
We Protect the Things That Protect You.®
STI is a manufacturer of specialist fire, safety and security products. Our products help deter false alarms and prevent theft and vandalism of smoke detectors, fire extinguishers and other essential fire and security equipment.
Our Products
Engineered to fit. Trusted to perform.
Safety doesn’t make headlines when it’s done right. It simply does its job. That’s the power of what we build: products that keep life moving, alarms sounding, systems activating, and people protected.
For nearly five decades, STI has been home to people who solve the problems others overlook. When customers face a challenge, we don’t just deliver a product, we deliver confidence in safety, reliability, and performance that lasts.
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Years in business
Founded 1978, Waterford, Michigan, United States
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Products & SKUs
Covers, cages, buttons, enclosures & more
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Countries using our products
EMEA, Americas, and beyond
Why Customers Keep Choosing STI
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Proven Performance
For more than 45 years, every STI product has earned trust through dependable design, durable materials, and rigorous testing. We do things right the first time.
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A Reputation Earned Over Time
• 45+ years of industry leadership
• Global reputation for quality and consistency
• Trusted in mission-critical environments worldwide
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Proactive Problem Solving
We don’t wait for problems to arise; we identify and resolve them before they disrupt performance. Every solution is designed with foresight, empathy, and real-world field experience.
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Designed Around Real-World Challenges
• Custom-engineered solutions for unique environments
• Deep expertise across fire, security & electrical systems
• Continuous improvement based on real-world feedback
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Responsive Partnership
With the care of a family-owned business and the reach of a global manufacturer, STI builds trust through responsiveness, fast lead times, and dedicated support.
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Support You Can Count On
• Known industry-wide for exceptional customer service
• Industry-leading lead times and on-time delivery
• Dedicated support from concept through installation
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Uninterrupted Reliability
Every STI solution is designed to prevent disruptions, minimize false activations, and maintain seamless operation; keeping people, buildings, and systems performing without disruption.
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Made to Keep Things Running
• Engineered to minimize false alarms and downtime
• Designed for reliability across diverse environments
• Proven to protect people, property, and productivity
Trusted by: Fire Protection Contractors • Electrical Contractors • Architects & Specifiers • OEM Manufacturers • Facilities Managers • Distributors Worldwide
Polycarbonate Thermostat Covers Prevent the Rising Cost of Utility Bills
These thermostat covers are recommended in areas where abuse or tampering of thermostats is a problem. Holes in the frame allow air to circulate freely for proper operation of the thermostat, but an interior wall prevents any tampering to the controls with a small object.
Euro Stopper® Multi Kit Polycarbonate Covers
Protective cover helps prevent malicious or accidental activation. The Euro Stopper® consists of a clear, tamper proof, tough UV-stabilised polycarbonate call point cover and frame that retrofits over the break glass call point.
