This 4-pack humidifier wick filter set is a replacement for Graco 2H01 and is compatible with Graco 2H00 / TrueAir 05510 Cool Mist 1.5 Gallon Humidifiers. Each wick filter traps impurities in the water to help reduce mineral deposits and support cleaner, more comfortable humidity output in bedrooms, nurseries, and other living spaces. The optimized multi-layer mesh design helps improve humidifier efficiency and maximize water output for consistent performance. For best results, replace the humidifier filter about every 2 - 3 months depending on use and local water quality. 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.