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Introducing Essick Air's Bottle Cap 3 1/4 W, a versatile accessory designed specifically for portable humidifiers. With its easy-to-fill design and durable construction, this bottle cap ensures leak-proof use for added peace of mind. The Bottle Cap 3 1/4 W is ideal for users looking to improve their indoor air quality while on the go or during travel. Its convenient size and easy maintenance make it an excellent addition to any humidification system, providing a range of benefits such as improved respiratory health, reduced static electricity, and enhanced comfort in dry environments. With Essick Air's commitment to quality and performance, you can trust the Bottle Cap 3 1/4 W to deliver optimal results.