Universal Stopper clear polycarbonate cover without a horn, but with English labelling for flush mounted manual pull stations

A durable physical barrier against damage and accidental activation.

The Universal Stopper is a versatile, high-strength polycarbonate cover designed to protect manual fire alarm pull stations. Unlike the Stopper II, this specific model does not include a local sounder (alarm). It focuses on providing a rugged physical shield to prevent mechanical damage and accidental triggers while keeping the pull station fully visible and ready for emergency use.

N.B. : This model of cover comes as a replacement for the Universal Stopper® which is discontinued.

This cover is UL listed hence the equipment and its installation meets Canadian standards. This piece of equipment is ideal for fire safety in public locations such as schools, hospitals, mills, etc.

STI™ product code: STI-1300

Universal Stopper® covers protect manual pull stations from impacts and help prevent false fire alarms without restricting legitimate alarms. The cover can easily be lifted and is connected to the frame by hinges. It was designed for indoors use only. Such an accessory requires a double action to trigger a fire alarm compared to a simple pull station which requires one sole move.

All labeling on the cover and instructions provided in the package are in English (PDF version available for download).

External dimensions:
Length 5.375 in x Height 8.125 in x Depth 2.75 in
(Length 13.65 cm x Height 20.64 cm x Depth 6.99 cm) 

Inner dimensions:
Length 4.875 in x Height 6.75 in x Depth 2.625 in
(Length 12.38 cm x Height 17.15 cm x Depth 6.67 cm) 

Polycarbonate thickness: 0.095 in (2.4 mm)

This cover fits most pull station models, mainly flush mounted ones.

Covers with French labeling are also available as prescribed by the Province of Quebec regulations (see item ECSTI1300FRE).

Key Benefits: Durability and Low Maintenance

This model is ideal for environments where a local siren isn't necessary, but physical protection is a priority:

• Impact Resistance: Made from high-impact polycarbonate, it effectively protects pull stations from stray balls, moving carts, or accidental bumps in high-traffic zones.

• Prevents Accidental Triggers: By requiring the user to lift the cover first, it prevents people from accidentally triggering the fire alarm by leaning against the wall or moving equipment nearby.

• Flush-Mount Compatibility: Specifically designed for pull stations that are installed "flush" against the wall (recessed into the wall).

• Clear Visibility: The transparent cover allows for 100% visibility of the pull station. It features bright red English instructions: "In Case of Fire, Lift Cover and Pull Station."

• Zero Maintenance: Since there is no electronic alarm, there are no batteries to replace, making this a "fit and forget" solution for long-term safety.

Technical Specifications

• Material: UV-stabilized, clear polycarbonate (resistant to cracking and yellowing).

• Local Alarm: None (Silent model).

• Instructions: Red silk-screened text in English.

• Mounting: Designed for Flush Mount installations.

• Certifications: UL/cUL Listed and ADA Compliant (slim profile).

Application Guide: Recommended Zones

This protector is highly recommended for:

1. Gymnasiums & Sports Centers: Where pull stations are frequently hit by sports equipment.

2. Warehouses & Factories: To protect against impacts from machinery, ladders, or tools.

3. Hospitals & Clinics: In corridors where hospital beds and rolling equipment are frequently moved.

4. Commercial Buildings: In areas where physical protection is required but the building does not suffer from malicious false alarms.

FAQ: Frequently Asked Questions

Does this cover hinder the fire department's response time?

No. The cover is designed to be lifted in one quick, intuitive motion. While it adds a small step to the process, fire safety authorities approve these devices because they significantly reduce the costly business interruptions caused by accidental alarms.

Can it be used outdoors?

While the polycarbonate is UV-stabilized, this specific model is primarily designed for indoor use. For outdoor protection against rain or snow, models with weather-tight gaskets are recommended.

Occupational Health and Safety (OHS) Expert Advice

• ADA Compliance: This flush-mount model does not protrude more than 4 inches from the wall, meeting accessibility standards for people with visual impairments or limited mobility.

• Cleaning: Use only mild soap and water with a soft cloth. Harsh chemicals or solvents can cloud the polycarbonate and reduce transparency over time.

• Deterrence Needs: If your facility suffers from intentional false alarms (vandalism), we suggest the Stopper II model, which includes a local siren to alert staff when the cover is lifted.

Polycarbonate properties:

Polycarbonate is a clear low flammability material highly resistant to impacts which features impressive mechanical and thermal properties, hence its use in so many fields. It is commonly used to manufacture safety eyewear, protective faceshield, law enforcement shield, optical lenses, thermal imaging and so many other vandal-proof items. The polycarbonate used for the fabrication of Universal Stopper® covers is UV-stabilized against degradation caused by the sun.

Maintenance and life service:

Some basic practices should be adopted to maintain manual pull station covers. It is thus recommended to wash the cover with lukewarm water and a gentle soap. The manufacturer strongly advises not to use steel pads since they scratch any surface they touch which will temper with the legibility of the label. It also is not recommended to use harsh soaps on the cover since polycarbonate doesn’t mix well at all with a wide array of acids and other chemical compounds. Indeed, these products will make your cover kind of melt. If the cover surface isn’t soft to the touch and bubbles appear, the cover has been corrupted and must be replaced.

As for its life service, the manufacturer asserts that his Universal Stopper® covers are durable.

Need additional safety equipment? See the following items: