For low volume Anasthesia / Ventilation, 99.9999%+ efficiency, hydrophobic pleated media , 22M/15F-15M/22F ISO connectors, low deadspace , with luer sampling port. Slimline pleat 8555/01 - For low volume Anasthesia / Ventilation, 99.9999%+ efficiency, hydrophobic pleated media , 22M/15F-15M/22F ISO connectors, low dead space, No luer port, Insufflation.