YUEFENG Humidifier Filter for Vicks & Kaz WF2 Humidifier V3100, V3500, V3500N, V3600, V3700, V3800, V3850, V3850JUV, V3900, V3900JUV, VEV320, 3020, ECM-250i, ECM-500, WA-8D, Replacement WF2