Milton 1-1/2” MNPT breather vent 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. While also reducing pneumatic noise levels in the work environment. Mufflers are composed of a pours 40 micron sintered bronze bonded to a cooper plated pipe thread and 2” hex shape for quick assembly or removal. These units offer a combination of small size and greatest possible sound deadening qualities to reduce exhaust noise to acceptable levels within OSHA noise requirements. Specification: - Max Pressure: 150 PSI - Max Temp: 35F to 300F - 40 micron brass sintered - 2” Hex - 1-1/2” MNPT