The replacement HC300 Extended Life Humidifier Chamber used with the HC100/150 Heated Humidifier and is designed to last for many years as it can be fully disassembled and cleaned. The unit is not dishwasher safe. The replacement is an upgrade to the Standard Water Chamber included with the HC100/150 Heated Humidifier. It can also be used on its own as an unheated/cold/passover humidifier. What's Included: HC300 water chamber 2 chamber connectors 1 inlet tube Setup Instructions Maximum Fill Level Tips Do not fill the water tank above the maximum fill line. Damage to the humidifier or therapy device may occur. If the water tank is overfilled, water may leak out of the tank inlet (located on the top of the tank) when installing the tank lid. When disconnecting the hose from the tank inlet, be careful to ensure that the hose is not holding water. Water could travel through the hose and into the machine. Use only room temperature distilled water in the tank. Do not put any chemicals or additives into the water. Possible airway irritation or damage to the water tank may result. Remove the tank, empty all water, and replace the empty tank before transporting the humidifier base. Do not attempt to fill the water tank while it is inside the humidifier. To avoid spilling, do not disconnect the humidifier from the therapy device with water in the tank. Remove the water tank from the humidifier before disconnecting the therapy device. Do not turn the humidifier on without the water tank installed. The Humidifier number setting must remain on 0 if there is no water in the water tank. The humidifier door must be set in the open position before removing the water tank. Do not remove the water tank without making sure that the humidifier door locks into the open position. Do not move the humidifier while the water tank has water in it. HC300