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Vent Diffuser 
A severe service vent diffuser provides a solution for noise sources such as (1) high noise potential due to low downstream pressure and associated high pressure drop and (2) throttling generated noise as a function of pressure drop.
WhisperFlo Vent DiffuserFisher® 6012 Vent Diffuser
The Fisher vent diffuser offers proven noise attenuation in steam, gas, or vapor venting applications. A vent diffuser places back pressure on the control valve while venting process to the atmosphere.
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