Durable Humidifier Bottle Caps with Elastic Valve for Essick-Air Devices – 2 Set
Compatible with AIR-CARE and Essick-Air models including Alliance, Credenza and Executive 400, 600, H12 series humidifiers, fits 4DTS900, 4DTS300, 447400HB, H12300HB, H12400HB, H12600, 696400HB, 696800.