The ORO-2 valve provides 12 rate settings: OFF, 1/4, 1/2, 1, 2, 3, 4, 6, 8, 10, 15, and 25 liters per minute (lpm). Features durable, all-metal construction and unique, easy-to-read flow rate dial. Unit includes DISS outlet fitting for connection to humidifier and standard barb adapter for connection to oxygen tubing. Backed by a 5-year warranty.