Changing a Propane Cylinder can sometimes give the forklift operator a big surprise! The seal in the cylinder valve can fail causing liquid propane gas to spray over the hand or face of the operator faster than they can react. Liquid propane vaporizes quickly (-420 C or -440 F) and will cause extreme frostbite if it touches skin. Takes just 15 minutes to install. It will last as long as the forklift!