Protect vacuum sources from contamination and moisture damage With hydrophobic PTFE membranes Polypropylene housing (except for SLFG-025-LS and -50, which have PVC housing) Variety of inlet/outlet combinations, including stepped hose barb and 1/8 NPT Sterilize ambient air entering fermenters Filter incubator gas to protect against contamination Filter nitrogen and air used to dry liquid samples Nonsterile, autoclavable, bidirectional