Fits the WF2 replacement filter for Honeywell, Vicks, Sunbeam and Kaz humidifiers. Compatible with models including Honeywell HCM-300T, HCM-350, HCM-631, Vicks V3100, Vicks V3700, HCM-710, HCM-315T, Vicks V3900, HCM-630, Vicks V3500N, Vicks V3500, HCM-350B, Vicks WF2, Sunbeam 1118, Sunbeam 1119, Sunbeam 1120, Robitussin DH835, ReliOn WA-8D, Kaz 3020, HCM-645, HCM-650, Vicks V3850JUV, Vicks V3850, Vicks V3800, replacement for Honeywell HCM- High quality construction - Built with rigid absorbent paper to help the filter keep its shape when wet and reduce sagging, supporting consistent airflow and filtration performance. Package contents - Upgrade package 4 Pack of Premium WF2 Humidifier Filters; this is a 4-pack, not a 3-pack. Tips for daily use - For best results, fill the humidifier tank with distilled water only. - Hard water can shorten filter life and cause yellowing, reducing performance over time.