<p>This permanent oxygen humidifier features a shatterproof, autoclavable polypropylene jar, an accurate (threaded) 2psi pressure relief valve, chromed brass connectors and removable diffuser head. this product is designed so that the jar always clears the cylinder.</p> <p><b>Reusable Humidifier</b></p> <p>* Designed for long-lasting use and easy disassembly for cleaning</p> <p>* Specially treated connectors for maximum durability</p> <p>* Distinct maximum and minimum water level lines</p> <p>* Audible alarm at 2 psi pressure relief</p> <p>* Holds 320 mL</p>