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Fisher™ 6060 WhisperTube Modal Attenuator
The WhisperTube is a passive reactive silencer designed for installation downstream of the control valve or other equipment contributing to system noise.
Requiring negligible pressure drop across the device, the WhisperTube achieves system noise reduction across a wide range of conditions without impacting the flow capacity or process.

Fisher WhisperTube Modal Attenuator

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Fisher™ 6060 WhisperTube Modal Attenuator


Body Sizes
NPS 2, 3, 4, 6, 8, 10 and 12
Critical Service
Noise abatement
End Connection Styles
CL150, CL300, or CL600 raised-face flanges compatible with ASME B16.5
Temperature Capability
-46 to 371°C (-50 to 700°F)


  • Broadband Noise Reduction — Patented design with internal acoustic cavities of varying sizes reduce noise across a broad range of frequencies.
  • Application Versatility — Designed for a wide range of fluid flow rates, pressures and temperatures. Reduce noise inside the pipe for all sources upstream. Pair the WhisperTube with any equipment used in compressible fluid service.
  • Maximize Flow Capacity — Negligible pressure drop across the WhisperTube other than the normally expected line loss for a pipe spool piece of equivalent length equates to noise attenuation with no impact on process flow.
  • Passive Reactive Silencer — Internal cavities produce acoustic wave reflections that reduce noise propagating downstream.
  • Reliable Performance — No internal acoustic packing material to fail from moisture absorption. Cast internal drain channel ensures any potential liquid buildup can be removed, ensuring optimum performance.
  • Compatible with Piggable Systems — Straight through flow geometry with inside diameter that matches the pipe accommodates pigging operations when required for cleaning and maintenance.
  • Sour Service Capability — NACE MR0103, MR0175 / ISO 15156 compliant materials of construction as standard for applications involving sour gas or vapor.
  • Quick and Easy Maintenance — Removeable cylindrical stainless steel screen for easy cleaning if required with no special tools needed.
  • Easy Installation — Threaded lifting provisions accommodate fitting the body with hoist rings or lifting eye bolts for optimized product control during installation.


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