Milton pnuematic exhaust mufflers are made to diffuse air and muffle air exhaust noise from exhaust ports of air tools, cylinders and valves to bring noise levels to acceptable OSHA requirements. They are made with a porous sintered bronze muffler bonder to a copper plated steel piple threaded male fitting. Maximum operating pressure is 300 PSI, maximum airflow is 20 SCFM @ 100 PSI, and operating temperature range is 40 F to 300 F.