COMPATIBILITY : The heat moisture ex-change for Z1, Z2 and more cpa-pmachine,the filter is connected between hose/tubing, so to determine whether it fit for your machine, please compare the diameter of our filter pipe with the diameter of your machine pipe diameter. PORTABLE DESIGN : The heat moisture ex-changer filter consists of a thick translucent housing and a blue sponge filter. Translucent housing makes it easy to see the product in use and ensures correct installation. The blue sponge filter in the middle filters out airborne particles and provides us with hot and humid gas. HIGHER PERFORMANCE : The heat moisture ex-changer filter is a waterless humidification unit that requires no additional power and takes up very little space, high density sponge filter absorbs heat and moisture from the environments and exhalations EASY TO USE : Simply install the heat moisture ex-change filter between the &k cp&ap tubing, a hose is required to connect tomask. Once connected, switch on the device and experience a constant stream of humidified gas. Tips: heat moisture ex-change filter NOT fit for face&mask with a short interface. REPLACEMENT TIME : The heat moisture ex-changer filter should be replaced after of use to optimum performance. However your filters may last for a longer or shorter amount of time depending on environmental conditions. Color: Transparent & Blue Material: plastic Package Contents: 10*Heat Moisture Exchanger Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.