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

🔩 3" Grooved Rigid Coupling – UL/FM Approved for Fire Protection & Mechanical Systems

This 3-inch Grooved Rigid Coupling is engineered to provide a strong, fixed connection between steel pipe sections in fire suppression, HVAC, and mechanical piping systems. Designed to eliminate pipe deflection, this rigid-style coupling ensures proper alignment and secure sealing under high pressure.

Built from ASTM A536 ductile iron and finished in protective orange enamel or galvanized coating, this coupling is equipped with a pre-lubricated EPDM gasket for long-lasting sealing performance. Fully UL Listed and FM Approved, it’s ideal for mission-critical installs that demand code compliance and reliability.

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⚙️ Key Features

• Size: 3" nominal pipe size (NPS)
• Pipe OD Compatibility: 3.500" (Schedule 40 steel pipe)
• Material: Ductile iron (ASTM A536)
• Gasket: Grade E EPDM, pre-lubricated
• Finish: Orange enamel or galvanized
• Design: Rigid – holds pipes firmly in alignment, no flex
• Certifications: UL Listed, FM Approved, ANSI/AWWA C606 compliant

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📐 Specifications

• Working Pressure: Up to 500 PSI
• Temperature Range: -30°F to 230°F (EPDM gasket)
• Installation Torque: 60–80 ft-lbs (typical)

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🧱 Why Ductile Iron?

Ductile iron is trusted for critical applications where performance, strength, and long service life are essential:

• High pressure tolerance: Built for demanding system loads
• Impact resistance: More durable than cast iron
• Corrosion protection: Factory-coated for long-term durability

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💡 Common Applications

• Fire sprinkler risers and mains
• HVAC chilled/condenser water systems
• Industrial mechanical piping
• Process water loops

Code-compliant. Jobsite ready. Built for performance.

❓ Frequently Asked Questions

1) What size pipe does this coupling fit?
It fits 3" nominal Schedule 40 steel pipe with a 3.500" outside diameter.

2) Is it UL/FM certified?
Yes — this coupling is both UL Listed and FM Approved for use in fire protection and mechanical piping systems.

3) What comes in the box?
The coupling includes the ductile iron housing, EPDM gasket, and bolts. Ready for installation.

4) Is this flexible?
No. This is a rigid coupling — it holds the pipe in fixed alignment with no movement.