SoClean 2 Cartridge Filter Kit (Includes Check Valve Free) Package:16 Filters helps prevent internal water damage

helps prevent internal water damage on all DreamStation CPAP & BiPAP Heated Humidifiers

and it allows the machine to be used without engaging the built-in HumidAir Humidifier

ResMed's fourth generation Mirage Quattro provides superior seal and personalized comfort in a streamlined design that looks sleek and feels ultra light on the face

from Philips Respironics

A smaller style full face mask

SoClean 2 Cartridge Filter Kit (Includes Check Valve Free) Package:16 Filters helps prevent internal water damageThis OEM SoClean 2 Cartridge Filter Kit includes one replacement filter for the SoClean 2 CPAP Sanitizer. For best performance SoClean 2 filters should be replaced on average every 6 months. This cartridge is compatible with both the SoClean 2 and the SoClean 2 Go. A check valve is included free as well!