DVC Honeywell HAC-504AW Humidifier Filter. 

Designed to Fit Honeywell HCM-600, HCM-710, HCM-300T, HCM315T, HCM-1000 series, HCM-2000 series, HCM-300 series, HCM-600 series, HCM-700 series, ECM-250i. 

For use with cool moisture evaporative humidifiers. 

Package contains 1 filter. 

OEM #HAC-504AW    

ER-1888