Arrow PneumaticsThis Quiet Flow muffler/filter utilizes porous sintered bronze directly bonded to nickel plated steel pip thread fillings to diffuse air and muffle noise from the exhausted ports of valves, cylinders and air tools. It offers a combination of small size with the greatest possible sound deadening qualities to reduce exhaust noise to acceptable levels within OSHA noise requirements.Size (NPT): 1/4 inOverall Length: 1 3/8 inHex: 9/16 inWeight: .04 lbsMax Operating Pressure: 300 PSIOperating Temperatures: 35°F to 300°F