Double Sphere Rubber Expansion Joint - 150# Flanges - NSF 372

A Double Sphere Rubber Expansion Joint with 150# drilled rotating flanges is a flexible piping connector designed to absorb movement, vibration, and noise in mechanical, plumbing, HVAC, and water service systems.

Key features 

• Double sphere design
  • The two-arch or double-sphere body provides greater flexibility than a single-sphere joint.
  • Helps accommodate:
    • axial compression and extension
    • lateral movement
    • angular deflection
  • Commonly used where piping systems experience thermal expansion, pump vibration, or minor misalignment.
• Rubber expansion joint
  • Constructed with elastomeric materials and reinforcing fabric/cord layers.
  • Reduces stress on pumps, valves, and adjacent piping by isolating movement and mechanical strain.
• 150# drilled rotating flanges
  • Flanges are drilled to match standard ANSI/ASME 150 lb bolt patterns.
  • Rotating flanges simplify installation by allowing easier bolt-hole alignment in the field.
  • This can reduce installation time and help when connecting to existing piping systems.
• Provides sound/vibration isolation
  • The rubber body acts as a flexible isolator between vibrating equipment and rigid piping.
  • Helps minimize transmission of:
    • pump vibration
    • equipment noise
    • hydraulic shock and pulsation
  • Often selected to improve system quietness and protect connected equipment.
• NSF 372 lead-free
  • Certified to NSF/ANSI/CAN 372, indicating compliance with lead-free requirements for potable water system components.
  • Suitable for applications where lead-free materials are required by code or specification.
• EPDM and Neoprene options
  • EPDM
    • Excellent for hot and cold water, HVAC, mild chemicals, and ozone/weather resistance.
    • Common choice for water-based services.
  • Neoprene
    • Good resistance to oils, grease, weathering, and general industrial service.
    • Often used where a broader general-purpose elastomer is desired.

Typical applications

- HVAC piping - Pump suction and discharge lines - Water and plumbing systems - Chiller and cooling tower connections - Industrial piping requiring vibration control and movement absorption

In summary

This product is a flexible, lead-free rubber connector with double-sphere construction for enhanced movement capability, 150 lb rotating flanges for easier installation, and EPDM or Neoprene elastomer options for compatibility with different services, while also providing effective noise and vibration isolation.