Think Crucial 2 Replacements for Robitussin Humidifier Wick Filter, Compatible With Part # AC-813, AC813, AC 813, D13-C, D13C, D13 C Robitussin brand wick filter Replace every 2 months High quality wicking humidifier filters Absolutely essential for allergy sufferers Fits Robitussin DH832, RMC832, Sesame Street SH100, SH200, American Red Cross Humidifier 7087 and Y7087