5" Grooved Rigid Coupling – Ductile Iron, UL/FM Approved

🔩 5" Grooved Rigid Coupling – UL/FM Approved for Fire, HVAC & Mechanical Systems

This 5-inch Grooved Rigid Coupling delivers a strong, non-flexing pipe connection ideal for high-demand systems like fire protection mains, HVAC water loops, and industrial mechanical piping. It is engineered to keep pipes in fixed alignment with no axial or angular movement, ensuring system integrity under pressure and vibration.

Made from rugged ASTM A536 ductile iron and coated in protective orange enamel or zinc galvanization, it comes with a factory-lubricated EPDM gasket for a watertight seal. This coupling is both UL Listed and FM Approved and built to meet the highest standards for safety and durability.

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⚙️ Key Features

• Size: 5" nominal pipe size (NPS)
• Pipe OD Compatibility: 5.563" (Schedule 40 steel pipe)
• Material: Ductile iron (ASTM A536)
• Gasket: Grade E EPDM, pre-lubricated
• Finish: Painted (orange enamel) or galvanized
• Design: Rigid coupling – no flex, fixed alignment
• Certifications: UL Listed, FM Approved, ANSI/AWWA C606 compliant

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📐 Specifications

• Working Pressure: Up to 500 PSI (depending on system)
• Temperature Range: -30°F to 230°F (EPDM gasket)
• Installation Torque: 90–110 ft-lbs

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🧱 Why Ductile Iron?

Ductile iron offers the strength, resilience, and corrosion resistance needed for large-scale mechanical and fire systems:

• High system tolerance: Performs under pressure and vibration
• Durable construction: Crack- and impact-resistant
• Corrosion protection: Factory-applied finish for long life

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💡 Common Applications

• Fire suppression mains in commercial buildings
• HVAC water loops in large mechanical systems
• Industrial process piping
• Utility room risers and manifold connections

Code-compliant. Built for contractors. Trusted in the field.

❓ Frequently Asked Questions

1) What pipe size does this fit?
This coupling fits 5" Schedule 40 steel pipe with an outside diameter of 5.563".

2) Is it UL/FM certified?
Yes. This product is UL Listed and FM Approved for use in fire, HVAC, and mechanical piping systems.

3) What comes with it?
Each coupling includes a ductile iron housing, pre-lubricated EPDM gasket, and heavy-duty bolts.

4) Is this a rigid or flexible coupling?
Rigid. It holds pipe sections in fixed alignment with zero movement or deflection.