3" Grooved Flexible Coupling – Ductile Iron, UL/FM Approved

🔩 3" Grooved Flexible Coupling – UL/FM Approved for Fire, HVAC & Mechanical Piping

This 3-inch Grooved Flexible Coupling delivers a fast, secure, and durable connection for piping systems used in fire protection, HVAC, industrial, and commercial plumbing. Built with ductile iron housings and a flexible EPDM gasket, this coupling allows for controlled pipe movement, reduces vibration, and helps minimize stress on the piping system — all while maintaining a reliable seal under pressure.

Designed to meet the highest standards of performance, this coupling is UL Listed and FM Approved for use in critical applications. It’s easy to install, easy to maintain, and trusted by contractors and mechanical pros across the country.

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⚙️ Key Features

• Size: 3" nominal pipe size (NPS)
• Flexible joint allows for axial movement and vibration absorption
• Material: Ductile iron housing with protective coating
• Gasket: Pre-lubricated EPDM for water-based systems
• Approvals: UL Listed, FM Approved, ANSI/AWWA C606 compliant
• Installation: Quick bolt-pad design with heavy-duty steel bolts

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📐 Specifications

• Pipe OD Compatibility: 3.500" (Standard for 3" Schedule 40 steel pipe)
• Working Pressure: Up to 500 PSI (application dependent)
• Temperature Range: -30°F to 230°F (EPDM gasket)
• Finish: Painted or galvanized for corrosion protection
• Installation Torque: Typically 50–60 ft-lbs

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🧱 Why Ductile Iron?

Ductile iron is the preferred material for grooved couplings in demanding systems. Here’s why:

• Strength: Handles high pressure and mechanical stress
• Flexibility: Allows pipe movement and reduces strain on connections
• Durability: Long-lasting, crack-resistant, and impact-tolerant
• Corrosion Resistance: Factory-coated for protection against moisture and harsh conditions

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💡 Common Applications

• Fire sprinkler systems
• HVAC chilled/condenser water systems
• Process piping in commercial and industrial buildings
• Mechanical system retrofits and new installs

Certified for safety. Built for performance. Ready to install.

❓ Frequently Asked Questions

1) What size pipe does this fit?
It’s designed for 3" nominal pipe size, which typically has a 3.500" outside diameter.

2) Is it approved for fire sprinkler systems?
Yes — this coupling is both UL Listed and FM Approved, making it suitable for fire suppression and mechanical systems.

3) Does it include the gasket and bolts?
Yes. Each unit includes the ductile iron housing, EPDM gasket, and heavy-duty steel bolts.

4) Can I use this coupling for gas lines?
No — this model is rated for water-based systems only. For gas piping, consult gas-rated fittings.