Oxygen Humidifier Bottle for 1 pk & Right Angle Bottle Elbow & 12” Adapter Tubing -Lightweight Portable Plastic

Material Selection: the cup body is made of PP engineering plastic, compared to PE, the material is more environmentally friendly, safe and non-toxic. The lower density makes the cup lighter, the higher hardness makes it hard to break. This increases safety, reliability and effectiveness during your use of the device.
Workmanship: the cup body is etched with a full circle of Maximum and Minimum water level indicator marks, the font is clear. Add water between the two marks, then you can get the humidity you want.
Safety: 6psi pressure relief valve designed to release excess pressure in the cup to reduce high pressure damage to the equipment. In addition, thicken the cup body and smooth the rim to prevent you from unnecessary damage when switching the lid.