1,Air Exhaust Muffler 2,Air Exhaust Silencer 3,Air Exhaust Noise Muffler 4,Pneumatic Silencer 3/8 NPT 5,Vacuum Pump Muffler. Air Exhaust Silencers are used to quiet air exhausted from pneumatic air tools, industrial air guns, blow molds, air cylinders and other air/pneumatic systems. Use where contaminants ordinarily clog air silencers on air tools. Air Exhaust Muffler High Pressure MufflerRelief ...