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

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

This 4-inch Grooved Flexible Coupling is engineered for use in commercial and industrial piping systems where flexibility, speed, and reliability are critical. Whether you're working on a fire suppression system, chilled water line, or mechanical loop, this coupling allows for quick, secure pipe connections with room for axial movement and angular deflection.

Made from ductile iron with a corrosion-resistant finish and equipped with a pre-lubricated EPDM gasket, it delivers strong sealing performance while reducing vibration, stress, and misalignment in the system. Fully UL Listed and FM Approved, this coupling meets rigorous performance standards and ensures code compliance.

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⚙️ Key Features

• Size: 4" nominal pipe size (NPS)
• Flexible design absorbs movement and vibration
• Material: Ductile iron body with corrosion-resistant coating
• Gasket: EPDM rubber gasket (factory lubricated)
• Certification: UL Listed, FM Approved, ANSI/AWWA C606 compliant
• Bolt Pads: Engineered for easy, secure alignment and installation

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📐 Specifications

• Pipe OD Compatibility: 4.500" (Standard for 4" Schedule 40 steel pipe)
• Working Pressure: Up to 500 PSI (application dependent)
• Temperature Range: -30°F to 230°F (EPDM gasket)
• Installation Torque: Typically 60–80 ft-lbs
• Finish: Painted or galvanized (depending on model)

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🧱 Why Ductile Iron?

Ductile iron offers the strength and reliability required for high-performance piping systems. It’s the material of choice for grooved fittings because:

• High Strength: Handles heavy system pressures and dynamic loads
• Durability: Impact- and crack-resistant for long service life
• Flexibility: Supports pipe movement and thermal expansion
• Corrosion Resistance: Factory coating protects against rust and moisture

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💡 Common Applications

• Fire sprinkler main lines and branch piping
• HVAC chilled water systems
• Mechanical systems in commercial and industrial facilities
• Process water and return loops

Certified. Reliable. Built to perform under pressure.

❓ Frequently Asked Questions

1) What size pipe is this designed for?
This coupling is designed for standard 4" Schedule 40 steel pipe, which has an OD of 4.500".

2) Is it UL/FM certified for fire systems?
Yes. This coupling is both UL Listed and FM Approved, making it ideal for fire sprinkler and suppression systems.

3) Does this include the bolts and gasket?
Yes. Each coupling includes the housing, pre-lubricated EPDM gasket, and steel bolts — ready for installation.

4) Can I use this with PVC or CPVC?
No. It is designed for use with steel or ductile iron piping only. Not intended for plastic piping systems.