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

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

The 1-inch Grooved Flexible Coupling is a compact and reliable solution for connecting steel pipes in fire suppression, mechanical, and HVAC systems. Its flexible design allows for limited axial movement, angular deflection, and vibration absorption — all while maintaining a secure, leak-resistant joint.

Crafted from ductile iron (ASTM A536) with a durable orange enamel or galvanized finish, this coupling includes a Grade E EPDM gasket and is fully UL Listed and FM Approved for code-compliant use in high-performance applications.

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⚙️ Key Features

• Size: 1" nominal pipe size (NPS)
• Pipe OD Compatibility: 1.315" (Schedule 40 steel pipe)
• Material: Ductile iron housing (ASTM A536)
• Gasket: Grade E EPDM, pre-lubricated
• Finish: Orange enamel or galvanized for corrosion protection
• Design: Flexible – allows for movement and deflection
• 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
• Angular Deflection: ±1° (varies by installation)
• Installation Torque: Typically 30–50 ft-lbs

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🧱 Why Use a Flexible Coupling?

Flexible couplings provide key advantages in small-diameter piping systems:

• Absorbs system vibration from pumps or flow surges
• Allows for thermal expansion/contraction in compact runs
• Reduces alignment stress during installation
• Improves sealing reliability in active mechanical environments

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💡 Common Applications

• Small-diameter fire sprinkler systems
• Mechanical and HVAC branch piping
• Boiler room and utility connections
• Low-flow industrial process lines

Compact. Compliant. Built for movement and pressure.

❓ Frequently Asked Questions

1) What pipe size is this designed for?
This coupling is made for 1" Schedule 40 steel pipe, which has an OD of 1.315".

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

3) Does it allow for pipe movement?
Yes — this is a flexible coupling designed to allow limited axial and angular movement.

4) What's included?
Each unit includes the ductile iron housing, pre-lubricated EPDM gasket, and installation bolts.