Stopper II® clear polycarbonate cover without horn, but with English labelling for surface mounted manual pull stations

Stopper II Manual Station Cover (No Local Alarm, English Instructions) – Surface Mount

This protective cover is designed to shield manual fire alarm stations from accidental damage, dust, and environmental factors. Unlike some other models, this specific version does not include an integrated local alarm but features clear instructions in English to guide users during an emergency. It is specifically built for surface-mounted manual stations.

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-1230

Stopper II® 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 a metal cable. 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 7.125 in x Height 10 in x Depth 5.5 in
(Length 18.1 cm x Height 25.4 cm x Depth 14 cm) 

Inner dimensions:
Length 5.5 in x Height 6 in x Depth 5.5 in
(Length 14 cm x Height 15.24 cm x Depth 14 cm) 

Polycarbonate thickness: 0.095 in (2.4 mm) 

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

Covers with French labeling are also available as prescribed by the Province of Quebec regulations (see item ESCTI1230FRE).

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 Stopper II® 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 Stopper II® covers are durable; some have been in service for almost 20 years.

Why Choose This Stopper II Cover?

• Robust Physical Shielding: Constructed from heavy-duty polycarbonate, it provides a tough barrier against impacts and vandalism.

• Accidental Activation Prevention: The physical presence of the cover requires a deliberate two-step action (lift then pull), which significantly reduces false alarms caused by accidental bumps or pranks.

• Environmental Protection: Helps keep the manual station clean and functional by protecting it from dust and debris, especially in industrial or high-traffic areas.

• Surface Mount Compatibility: Designed with the necessary depth to fit over fire alarm stations that are mounted directly on the wall surface rather than being recessed.

• Clear Instructions: Features bold English text to ensure that even under stress, individuals understand how to access the alarm station.

Technical Specifications

• Model: Stopper II (STI-1200 series style).

• Alarm: None (no local horn/buzzer).

• Mounting Type: Surface mount.

• Material: Clear, high-strength polycarbonate.

• Language: English instructions.

• Application: Indoor use.

Frequently Asked Questions (FAQ)

Does this cover set off the fire alarm when lifted?

No. This specific model does not have a local alarm, and lifting the cover does not trigger the building's fire alarm system. To activate the fire alarm, the user must first lift the cover and then pull the manual station lever.

Can this be used for outdoor installations?

This model is generally intended for indoor use. For outdoor or weather-exposed areas, a weather-sealed model with specialized gaskets is recommended to prevent water infiltration.

How do I install this over an existing station?

The cover is designed to be installed directly over the existing manual station. It typically requires mounting the back frame to the wall around the station using standard screws and anchors.

Is the polycarbonate resistant to yellowing?

Yes, the high-quality polycarbonate used in Stopper II covers is designed to maintain its clarity over time, ensuring the manual station remains visible.

OHS Expert Advice

"While some managers prefer models with local alarms to deter pranksters, this non-alarmed version is ideal for environments where high noise levels or sensitive occupants make a local buzzer undesirable. It provides the necessary physical protection without adding extra noise. Always ensure that the lift-up motion is smooth during your monthly safety walk-throughs and that the English instructions remain legible and unobstructed."

Do you need additional safety equipment?

Check out these items:  18-inch orange warning cone (EPTCONE), yellow plastic monthly inspection tag (IPTAG4), 10 lb class ABC portable powder fire extinguisher (EXABC10), outdoor plastic surface cabinet (EC9), 20 lb portable powder fire extinguisher (EXABC20).

Under “Accessories” at the bottom of the page. If you are looking for work equipment, check out the following products: Stopper II cover without local alarm (ECSTI1200FRE), manual wall-mounted fire alarm station (ECST270), or Weather Stopper cover (ECSTI3150FRE).

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