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

🔩 6" Grooved Rigid Coupling – UL/FM Approved for Fire, Mechanical, and Industrial Systems

The 6-inch Grooved Rigid Coupling is built for heavy-duty applications where absolute pipe alignment and zero movement are critical. Ideal for fire protection mains, mechanical risers, HVAC loops, and industrial piping, this coupling ensures a secure, leak-free connection that resists vibration and shifting under pressure.

Crafted from high-strength ductile iron (ASTM A536) and coated with corrosion-resistant orange enamel or galvanization, it includes a pre-lubricated Grade E EPDM gasket for dependable sealing. This coupling is both UL Listed and FM Approved for use in fire and commercial piping systems.

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⚙️ Key Features

• Size: 6" nominal pipe size (NPS)
• Pipe OD Compatibility: 6.625" (Schedule 40 steel pipe)
• Material: Ductile iron, ASTM A536
• Gasket: EPDM, Grade E, factory-lubricated
• Finish: Orange enamel or galvanized
• Design: Rigid – no axial or angular movement
• Certifications: UL Listed, FM Approved, ANSI/AWWA C606 compliant

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📐 Specifications

• Working Pressure: Up to 500 PSI (application dependent)
• Temperature Range: -30°F to 230°F
• Installation Torque: 100–120 ft-lbs

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🧱 Why Ductile Iron?

Ductile iron is the proven material of choice for critical infrastructure:

• High strength: Withstands pressure surges and mechanical stress
• Durable construction: Long service life in demanding systems
• Corrosion resistance: Protective coating stands up to harsh environments

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💡 Common Applications

• Fire suppression mains in warehouses and high-rises
• Mechanical and utility risers in commercial buildings
• HVAC system loops and returns
• Large-scale industrial water and fluid systems

Certified for pressure. Built for performance. Trusted in the field.

❓ Frequently Asked Questions

1) What size pipe is this for?
This coupling fits 6" nominal Schedule 40 steel pipe with a 6.625" outside diameter.

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

3) What's included?
Each unit includes the ductile iron housing, pre-lubricated EPDM gasket, and two bolts — ready for install.

4) Is it flexible?
No — this is a rigid coupling. It keeps pipe segments fixed in position with no deflection.