Excellent for protecting vacuum pump systems from solvent vapor or gaseous contaminants and aqueous aerosols. Designed for inline use with stepped barb connections for 1NA to 12 mm i.d. hose. Available with choice of chemical trap: activated carbon, molecular sieve, or desiccant. Membrane retains 99.99% of airbone particles greater than NA.1 µm. Features hydrophobic polytetrafluoroethylene (PTFE) membrane. Whatman VACUGUARD capsule filters from Cytiva are ideal for protecting vacuum pump systems from solvent vapor or gaseous contaminants and aqueous aerosols.