1-1/4" Grooved Rigid Coupling – Ductile Iron, UL/FM Approved

🔩 1-1/4" Grooved Rigid Coupling – UL/FM Approved for Fire Protection & Mechanical Systems

This 1-1/4 inch Grooved Rigid Coupling is engineered to deliver a tight, secure, and non-deflecting connection between steel pipes. Commonly used in fire suppression systems, HVAC lines, and mechanical piping, it ensures a rigid joint that maintains system alignment and resists flexing under pressure.

Constructed from high-strength ductile iron and coated with an orange enamel finish for corrosion protection, it comes equipped with a pre-lubricated EPDM rubber gasket to ensure a long-lasting seal. It is fully UL Listed and FM Approved, meeting industry standards for reliability and performance.

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⚙️ Key Features

• Size: 1-1/4" nominal pipe size (NPS)
• Material: ASTM A536 ductile iron housing
• Finish: Non-lead orange enamel paint or galvanized (varies by model)
• Gasket: Grade E EPDM, pre-lubricated for water systems
• Design: Rigid coupling – non-flexing, fixed pipe alignment
• Certifications: UL Listed and FM Approved

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📐 Specifications

• Pipe OD Compatibility: 1.660" (standard for 1-1/4" Schedule 40 steel pipe)
• Working Pressure: Up to 500 PSI (application dependent)
• Temperature Range: -30°F to 230°F (EPDM gasket)
• Installation Torque: Typically 30–50 ft-lbs

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🧱 Why Choose Ductile Iron?

Ductile iron is trusted in the industry for grooved fittings due to its strength, longevity, and adaptability:

• High-pressure tolerance: Ideal for demanding mechanical systems
• Durability: Impact and vibration-resistant
• Corrosion protection: Coated to perform in wet and humid conditions

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💡 Applications

• Fire sprinkler and riser systems
• Commercial HVAC piping
• Mechanical room connections
• Industrial water lines

Built tough for commercial performance and trusted by pros nationwide.

❓ Frequently Asked Questions

1) What size pipe does this fit?
This coupling fits 1-1/4" nominal pipe size, which has a 1.660" outside diameter.

2) Is it UL/FM approved for fire use?
Yes. It is UL Listed and FM Approved for use in fire sprinkler and suppression piping.

3) Does this include the necessary bolts and gasket?
Yes. Each coupling comes complete with housing, EPDM gasket, and bolts for installation.

4) Can I use this with PVC pipe?
No. It is designed for use with steel or ductile iron piping only.