Medical supply businesses, such as Tri-Med, Inc., supply oxygen tank refills and systems to customers needing home oxygen therapy. Lawn and garden stores, such as Tractor Supply Company, refill and sell oxygen tanks used in welding.
Doctors typically prescribe oxygen therapy for patients suffering from illnesses that cause breathing conditions. Suppliers typically come to the patient's home to refill and install the oxygen tanks on a regular schedule. Oxygen suppliers carry large tanks as well as portable and emergency regulators, nebulizers and accessories, which often do not require a prescription. Welding oxygen is available in a variety of cylinder sizes, which gives each cylinder style different burn times.