Filter-Mufflers have selective permeability with optimum filtering and diffusion for air and other gases and liquidsTough standard porous bronze metal filter in 40 Micron provides strength and performanceEffective for many purposes, including muffling air valve noise; filtering exhaust and intake air; cryogenic phase separation; coalescing of oil mist and water vapor; and pressure or vacuum equalizationCompact, inexpensive and easy-to-use muffler is suitable for use where space is limitedModifications are available using Stainless Steel, Brass, or other MicronsRecommended for general purpose air exhaust applications for pressures up to 125 psi (8.6 Bar)