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

🔩 8" Grooved Rigid Coupling – UL/FM Approved for Large-Scale Fire & Mechanical Piping

The 8-inch Grooved Rigid Coupling is engineered for heavy-duty applications where a fixed, no-deflection connection is essential. It’s designed for large fire suppression mains, mechanical risers, industrial water systems, and chilled water loops where alignment must remain locked under high pressure and load.

This coupling is made from high-strength ASTM A536 ductile iron with a corrosion-resistant orange enamel or galvanized finish. It includes a pre-lubricated Grade E EPDM gasket for quick, secure, and watertight installation. It is fully UL Listed and FM Approved, meeting the highest standards for safety and reliability in large-diameter pipe systems.

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⚙️ Key Features

• Size: 8" nominal pipe size (NPS)
• Pipe OD Compatibility: 8.625" (Standard for 8" Schedule 40 steel pipe)
• Material: Ductile iron housing (ASTM A536)
• Gasket: Grade E EPDM, factory-lubricated
• Finish: Orange enamel or galvanized (varies by model)
• Design: Rigid – zero axial or angular pipe 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: Typically 130–150 ft-lbs

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🧱 Why Ductile Iron?

Ductile iron is the industry standard for large grooved fittings because of its proven ability to:

• Withstand high pressure and pipe weight
• Resist cracking under impact or vibration
• Hold alignment in vertical risers and long runs
• Prevent corrosion with factory-applied coating

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💡 Common Applications

• Large commercial fire sprinkler systems
• HVAC chilled water mains in campuses or towers
• Industrial cooling or process water systems
• Mechanical risers and trunk lines in high-rise buildings

Big system reliability. Certified for fire and mechanical use. Built to last.

❓ Frequently Asked Questions

1) What pipe does this fit?
This coupling is designed for 8" Schedule 40 steel pipe, which has an outside diameter of 8.625".

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

3) What’s included?
Each coupling includes a ductile iron housing, pre-lubricated EPDM gasket, and heavy-duty bolts — ready to install.

4) Is this a flexible coupling?
No — this is a rigid coupling designed to keep pipe alignment fixed with no movement or deflection.