This 47mm aerosol filter holder is open-face for environmental monitoring or sampling of open atmosphere air and gases. Use for particulate or bacterial analysis. Thermoplastic polymer Polypropylene (PP) construction makes this holder durable and compatible with a wide range of chemical solvents and temperatures. An affordable alternative to stainless steel holders. Standard O-rings: Silicone; Sealing O-ring: PTFE. Inlet: Open-faced. Outlet: Combination 1/4" NPTM to female slip. Outlet Adaptor 11mm O.D. hose barb included.