Norgren quietaire t40 series sintered bronze pneumatic silencers norgren t40c4800 a sintered bronze pneumatic silencer from the norgren quietaire series the unit can work as both an exhaust silencer to reduce the noise levels of pneumatic equipment and as an inlet filter to prevent the ingress of dirt the silencer is mounted directly into the exhaust or vent port norgren quietaire t40c4800 sintered bronze silencer g12 port