ITEM NAME:5PCS Pneumatic Air Breather Vent Silencer Muffler Threaded NPT 1/4" AT3C Features: Type: Sintered Bronze Muffler Breather Vent NPT Dimension: 1/4" Base Material: Brass Filtering Element: Sintered Bronze Working Pressure: 0-116 PSI, Working temperature: from -10 to +70 Â ºC. Used with: Cylinders, Valves, Crank cases, gear boxes, oil tanks, reservoirs, air tools. Very popular in space limited applications due to low profile. Designed for 1. Filtering exhaust and intake air from potential dirt and foreign particles, thus prolonging valve’s life. 2. Noise muffling during pressure equalization..Type: Sintered Bronze Muffler Breather Vent NPT. 5pc x Sintered Bronze Muffler. Cylinders, Valves, Crank cases, gear boxes, oil tanks, reservoirs, air tools. Very popular in space limited applications due to low profile.