The 3.75" Replacement Levoit Ultrasonic Cool Mist Humidifier Classic 200 Tank Cap in white is a plastic accessory designed for the Levoit brand's tabletop humidifier model. With a tank capacity of 4.5 gallons and a recommendation for medium-sized rooms, this cap is ideal for whole-room humidification with a focus on quiet operation. As a part of the 2022 collection, this timerless cap ensures a sleek and efficient addition to any room in need of improved indoor air quality. Ships From USA.