LIFE® Emergency Oxygen units come equipped with lightweight aluminum cylinders that are disposable (recyclable) or refillable (renewable) for lowest cost, greater efficiency, and customer ease. Refilling a cylinder at a local gas distributor is low in cost, but purchasing a replacement or spare cylinder may be more efficient with less time and labor...and may be the most economical method of assuring a sufficient supply of Emergency Oxygen is available at all times. Both methods are green and earth friendly. Having a LIFE® Emergency Oxygen unit and spare cylinder as part of a first-aid program is crucial to providing lifesaving oxygen before medical help arrives. Distributor Inquiries Welcomed!