Product review (2 stars): Doesn't fit all models listed.
These were advertised to fit all sorts of humidifiers, including my Robitussin DH-832; however, they are way to long, wide, and thick to fit. In the picture, it looks much smaller. It is not even worth returning, because I would have to pay the return shipping.

Description
"Fits Robitussin Models: DH832, RCM832, RCM833, WF813, AGW813, DH830, DH-832, RCM-832, RCM-833, WF-813, AGW-813, DH-830, Sesame Street SH100, SH200"