FESTO Gas Sensors Muffler 612348 - FESTO 534225, The Festo 534225 muffler is constructed from copper and can withstand pressures up to 10 bar. It is designed for noise reduction in pneumatic systems and has a connection size of U-1/2-20. This component is suitable for use in industrial applications to maintain a quieter workspace. FESTO 534225 Muffler U-1/2-20 10 bar Copper for noise reduction