FilterBuy Replacement Humidifier Wick Filters Compatible with WF813 ReliOn, AC-813 Duracraft, ACR-832 Robitussin. Pack of 4. Pack of 4 WF813 ReliOn, AC-813 Duracraft, ACR-832 Robitussin Humidifier Wick Replacement Filters. Also replaces the following OEM part #'s AC 813, AC-813, AC813, ACR-832, D13-C, D13C. Designed and engineered by FilterBuy to fit the following humidifier filter model #'s: ReliOn RCM832 (RCM-832) RCM-832N, DH-832 and DH-830. Also fits Duracraft / Robitussin Humidifier models DH830, DH832, HC832. Premium humidifier wick filter designed by FilterBuy to reduce pollutants. Replace at least once per season. Humidifier FilterBuy: Breathe Better!