These breather vents from Milton Industries Inc.® are the last pneumatic muffler you'll ever need. The air compressor muffler prevents dust and foreign particles from entering the port to the atmosphere by providing a vacuum relief or pressure equalization on gear boxes, oil tanks or reservoirs. The pneumatic air filter also uses micron to filter air while silencing, reducing noise levels in the work environment to OSHA-approved levels. Milton compressed air pneumatic mufflers are composed of 40 micron sintered bronze bonded to a cooper plated pipe thread and use a hex shape for quick assembly or removal. For a compact, effective noise reducer and a valve muffler that works, try this breather vent muffler.