The Nucon range of ZN/SB Sintered Bronze Heavy Duty Silencers have been designed to reduce noise levels in accordance with those specified in the Department of Environment U.K Code of practice for reducing the exposure of employed person to noise. They are of robust all metal (Powder metallurgy) construction and are unaffected by extremes of temperature. Manufactured for long maintenance free life. These Heavy Duty Silencers are designed to reduce clogging and consequent deterioration of their low back pressure characteristics. The threads are male and can easily be screwed into the exhaust port of a pneumatic valve or other piece of equipment. Exhaust noise levels are reduced to below 90 dB (A) and comply with department of environment's requirements.