Heavy-Duty Flexible Grooved Coupling | UL/FM Approved | Ductile Iron (ASTM A536) | EPDM/NBR | DN25–DN300 (1″–12″)
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Heavy-Duty Flexible Grooved Coupling | UL/FM Approved | Ductile Iron (ASTM A536) | EPDM/NBR | DN25–DN300 (1″–12″)

The Heavy-Duty Flexible Grooved Coupling joins grooved-end steel pipe while allowing controlled angular deflection, axial movement, and vibration attenuation—ideal for lines subject to thermal expansion/contraction, pumps and equipment tie-ins, and seismic or settlement considerations. Compared with rigid couplings, the flexible design helps relieve stress concentrations and reduce noise.

Construction & Materials
• High-strength ductile iron housing (ASTM A536) with corrosion-resistant finish (orange paint or hot-dip galvanized).
• Pressure-responsive gasket: EPDM (water/air), NBR (oils/fuels) available.
• Zinc-plated track-head bolts and heavy-duty nuts for reliable clamp load.

Standards & Compatibility
• Groove dimensions per AWWA C606; works with standard roll-grooved or cut-grooved pipe, and with grooved fittings/valves.
• UL Listed / FM Approved options suitable for fire sprinkler systems; also widely used in HVAC and industrial water services.

Typical Applications
Fire mains & risers, chilled water/HVAC loops, pump connections, long straight runs that require expansion compensation, and vibration-prone lines in industrial plants.
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