Restore proper water flow in your console humidifier with this 2-pack bottle cap with valve assembly replacement for part numbers 1980 / 1B-5060000 / 1B5060000. Compatible with Essick Air AirCare Bemis 400, 4DTS, 600, H12 series humidifiers including 426-300, 426-700, 427-300, 436-300, 447-301, 447-400HB, 447-401, 496-600, 496-800, 497-300, 497-800, 4029, 4161, 4261, 4262, 4273, 4362, 4363, 4371, 4962, 4963, 4968, 4971, 4973, 1500 / 4D6-800, 4D7-300, 4D7-800, 4DTS-300, 4DTS-400, 4DTS-900, 4DTS300, 4DTS400, 4DTS900 / 696-100, 696-400, 696-400HB, 696-800, 697-400, 697-500, 697-500HB, 6964, 6974, 696100, 696400, 696400HB, 696800, 697400, 697500, 697500HB / H12 300HB, H12 400HB, H12 600, H10 400, H12 001, H12 300, H12 400, H10400, H12001, H12300, H12400, H12600, H12 300HB(CN), H12 400HB(CN), H12 600(CN), 426300, 426700, 427300, 436300, 447301, 447400HB, 447401, 496600, 496800, 497300, 497800. Made from durable material with an elastic spring designed for long service life, this cap helps your unit maintain consistent operation when replacing a worn or leaking bottle cap; verify compatibility by matching your manual part number or measuring your existing cap before ordering. Disclaimer: This is not an Original Equipment Manufacturer (OEM) product, HQRP branded product is a replacement. All brand names and logos are registered trademarks of their respective owners. Any use of the brand names or model designations for this product are made solely for purposes of demonstrating compatibility.