Gibeck® ISO-Gard® Heat and Moisture Exchanger with Filter 33.81 mg H2O/L @ VT 500 mL 1.1 cm H2O @ 30 LPM (416525_CS) 20/CSIso Gard HEPA Light is an advanced, highly hydrophobic bacterial viral filter, HEPA class 13 Bacterial Viral filtration efficiency of 99. 9999+% Item Code 28002 includes gas sampling port with 22 mm ID 15 mm OD x 22 mm OD 15 mm ID connectors Item code 28012 has 22 mm ID 15 mm OD x 22 mm OD 15 mm ID connectors Item Code 28022 has 22 mm ID x 22 mm OD 15 mm ID connectors, ideal for machine filtration applications May be used as an HME (see moisture