Stainless Steel Circumferential Compression Diffuser (CCD) - Precision-molded strainer that allows the filtration of fine particles without restricting airflow. This product is compatible with both the titanium and stainless steel tips, and each three-pack should be used for months. WARNING: Cleaning with alcohol or other flammable liquids is not recommended. Alcohol will not damage any components of the VapCap, even if soaked for a long time, but its use is not recommended.