External threaded brass plug 2.5 inch with chain, threads adapted for the province of Quebec

2,5" Brass External Threaded Cap with Chain – QST Thread (Quebec)

This heavy-duty brass cap is a professional-grade solution designed to protect the female inlets of fire department connections (Siamese connections). Featuring the QST (Quebec Standard Thread), it is the high-quality standard for ensuring compliance and long-term protection of fire systems throughout the province of Quebec.

Why Choose This Brass External Threaded Cap?

• Maximum Durability: Forged from high-quality brass, this cap offers superior resistance to mechanical impacts and harsh environmental conditions compared to plastic alternatives.

• Siamese Inlet Protection: The external (male) thread is specifically designed to screw directly into the female swivel couplings of a building's water inlets.

• Complete Obstruction Barrier: It effectively seals the system against debris, snow, ice, or intentional vandalism (such as the insertion of stones or cans) that could block water flow during an emergency.

• Corrosion Resistance: Brass is naturally resistant to the elements, ensuring the threads remain functional and the cap does not seize over years of exposure.

• Secure Attachment: Includes a heavy-duty steel chain to permanently attach the cap to the Siamese body, preventing loss or accidental displacement.

Technical Specifications

• Nominal Diameter: 2.5 inches (65 mm).

• Thread Type: External (male), QST (7 threads per inch).

• Material: High-quality cast or forged brass.

• Accessory: Integrated heavy-duty safety chain.

• Application: Female inlets of Siamese connections and fire department water supply points in Quebec.

Frequently Asked Questions (FAQ)

Is a brass cap better than a plastic one?

Brass is significantly more durable and resistant to impact or extreme heat. However, in areas where metal theft is a high risk, some owners choose plastic as a deterrent, even though it is less robust than brass.

Will this fit a 2.5" fire hydrant outlet?

No. Fire hydrant outlets are typically male threads, which require a cap with internal threads. This cap has external threads and is designed specifically for female swivel inlets like those found on Siamese connections.

Can I use this in Montreal or Quebec City?

Yes. Both cities, along with the vast majority of the province, utilize the QST thread standard. It is the correct part for these jurisdictions.

How do I maintain this cap?

During your annual inspection, unscrew the cap to ensure the swivel connection on the Siamese unit moves freely. A light application of silicone lubricant on the brass threads can prevent seizing.

OHS Expert Advice

"A brass cap is the gold standard for fire protection. Its weight and strength ensure that the delicate check valves inside your Siamese connection are protected from the elements and tampering. While it is more expensive than plastic, its lifespan is virtually unlimited if maintained. Always ensure the chain is securely fastened; a missing cap is a major fire code violation that could prevent firefighters from saving your building in a crisis."

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).

Texts colored green correspond to hyperlinks leading to specific safety equipment or general information.