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

🔩 6" Grooved Flexible Coupling – UL/FM Approved for Fire Protection, HVAC & Industrial Use

This 6-inch Grooved Flexible Coupling is built to handle the demands of high-volume fire suppression, HVAC, and industrial piping systems. Made from ductile iron with a corrosion-resistant finish and equipped with a pre-lubricated EPDM gasket, it offers superior strength, reliability, and flexibility — making it ideal for both new installations and system retrofits.

Designed to allow for pipe movement, vibration absorption, and angular deflection, this coupling ensures a secure, leak-free connection even in dynamic environments. It is UL Listed and FM Approved for use in critical applications and meets ANSI/AWWA C606 standards.

---

⚙️ Key Features

• Size: 6" nominal pipe size (NPS)
• Flexible design helps manage thermal expansion and vibration
• Material: Ductile iron with protective paint or galvanization
• Gasket: EPDM rubber (pre-lubricated)
• Certifications: UL Listed, FM Approved, ANSI/AWWA C606 compliant
• Quick-connect bolt pad design simplifies installation

---

📐 Specifications

• Pipe OD Compatibility: 6.625" (Standard for 6" Schedule 40 steel pipe)
• Working Pressure: Up to 500 PSI (application dependent)
• Temperature Range: -30°F to 230°F (EPDM gasket)
• Installation Torque: Typically 80–100 ft-lbs

---

🧱 Why Ductile Iron?

Ductile iron is the preferred material for heavy-duty grooved fittings because it balances strength, flexibility, and longevity:

• High strength: Handles pressurized systems with confidence
• Crack resistance: More impact-resistant than cast iron
• Movement tolerance: Manages pipe misalignment and thermal shifts
• Corrosion protection: Factory-applied finish protects in wet and dry conditions

---

💡 Common Applications

• Fire sprinkler mains and risers in commercial buildings
• HVAC chilled water supply and return loops
• Industrial process and fluid transport lines
• Large mechanical system installations

Big system performance. Code-compliant. Built for tough environments.

❓ Frequently Asked Questions

1) What pipe size does this coupling fit?
It is made for 6" nominal pipe size, which has a 6.625" outside diameter.

2) Is it approved for fire protection systems?
Yes. This coupling is UL Listed and FM Approved for use in fire suppression and sprinkler system piping.

3) Is the gasket included?
Yes. Each coupling includes the EPDM gasket and two heavy-duty track bolts pre-installed in the ductile iron housing.

4) Can I use this with non-metallic pipe?
No. It is only compatible with steel or ductile iron piping. Not suitable for use with PVC or CPVC.