Oxygen Tank 20lbs refers to a portable oxygen cylinder that holds compressed oxygen gas, typically used in medical and industrial applications. The "20lbs" indicates the weight of the cylinder when it is filled with oxygen, meaning it can store a specific volume of oxygen for patient use or other applications. These tanks are designed for use with oxygen regulators and masks or nasal cannulas to deliver oxygen to patients who need respiratory support. They are commonly used in hospitals, emergency services, and for home oxygen therapy.