Twin Sphere Rubber Expansion Joint - Female NPT Threaded Unions

A Twin Sphere Rubber Expansion Joint with female NPT threaded unions, made of neoprene, for noise/vibration isolation is a flexible piping connector designed to reduce the transfer of movement, vibration, and sound between connected pipe sections or equipment.

Key features

• Twin sphere design
  • The two-arch or twin-sphere body provides greater flexibility than a single-sphere style.
  • Helps absorb:
    • vibration from pumps, compressors, and mechanical equipment
    • minor pipe misalignment
    • thermal expansion and contraction
    • pressure pulsation and shock
• Rubber construction: neoprene
  • Neoprene offers good resistance to:
    • water
    • mild chemicals
    • oils and grease to a limited degree
    • weathering and ozone
  • Commonly selected for general industrial, HVAC, and water service applications.
• Female NPT threaded unions
  • Threaded end connections allow straightforward installation into threaded piping systems.
  • Female NPT unions simplify assembly and removal for maintenance or replacement.
  • Best suited for smaller pipe sizes where threaded connections are standard.
• Noise and vibration isolation
  • The elastomer body helps dampen mechanical vibration before it travels into the piping system or building structure.
  • Can reduce noise generated by rotating equipment and fluid turbulence.
  • Often installed near:
    • pumps
    • chillers
    • air handlers
    • compressors
    • circulation equipment

Typical benefits

• Protects piping and connected equipment from stress
• Extends service life of pumps, valves, and fittings
• Reduces transmission of structure-borne noise
• Compensates for small movements in multiple directions
• Helps improve system reliability and maintenance access

Typical application note

This type of expansion joint is commonly used in HVAC, plumbing, water circulation, and light industrial piping systems where a compact, flexible connector is needed and threaded pipe connections are preferred.

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