Description Documents Specifications Description AprilAire HYDRLH Hard Water Maintenance Kit for 720 Series Humidifiers With L HydroCore™ Water Panel Cartridge. *** Kit also includes a replacement orifice & rubber seal cap (for hard water) Documents aprilaire-720-series-humidifier-maintenance-instructions-10021529 Specifications Manufacturer: Research Products Corp. Brand Name: Aprilaire Description: Aprilaire HydroCore Water Panel Part Number: HYDRLH (includes a new orifice & rubber seal cap) Compatibility: New Aprilaire 720M & 720A Nominal Size: 15″ x 10.5″ x 3.0″
