From DynaVap:

"Stainless Steel Circumferential Compression Diffuser (CCD) - 3-Pack of screens

Precision engineered component allowing for filtration of fine particles without restricting the airflow you’ve come to enjoy from DynaVap devices.

This product is compatible with all Titanium and Stainless Steel Tips, and each three-pack should offer months of extended use.

WARNING: Cleaning with alcohol or other flammable liquids is not recommended. Alcohol will not damage any component of the VapCap, even with prolonged soaking, but we do not recommend using it."