Silencer Extension Uoms-1/4 To Further Reduce The Level Of Noise, Up To Four Silencer Elements Can Be Fitted On Top Of One Another. Type Of Seal On Screw-In Stud=Without Seal, Assembly Position=Any, Design Structure=Open Silencer, Operating Pressure, Vacuum Generator=0 - 8 Bar, Corrosion Resistance Classification Crc=2 - Moderate Corrosion Stress