COMPATIBILITY: This heat moisture exchanger is compatible with Z1 and Z2 CPAP machines. The filter connects between the hose and tubing. To confirm compatibility, compare the diameter of the filter’s inlet/outlet with that of your machine’s tubing. PORTABLE DESIGN: The heat moisture exchanger features a thick, translucent housing and a blue sponge filter. The translucent housing allows visual confirmation of proper installation and usage. The blue sponge filter captures airborne particles while retaining heat and moisture from exhaled air. HIGHER PERFORMANCE: This waterless humidification unit requires no external power and occupies minimal space. The high-density sponge absorbs heat and moisture from exhaled breath and ambient air. EASY TO USE: Install the heat moisture exchanger between the CPAP mask and tubing. A hose is required to connect it to the mask. Once installed, turn on the device to receive continuously humidified airflow. Note: This filter is not suitable for masks with short interface connections. REPLACEMENT TIME: Replace the heat moisture exchanger every 7 days for optimal performance. Actual lifespan may vary depending on environmental conditions. Color: Transparent & Blue Material: Plastic Package Contents: 10 x Heat Moisture Exchangers Note: Light reflection and display settings may cause slight color variation between the image and the actual product. Measurement tolerance: ±1–3 cm.