The Big Max torch is the premier large propane torch on the market. The Big Max now comes with our Idle Boost/Fuel Saver Valve which allows you to adjust the flame down to a minimum then depress the handle which will allow full flow through the valve while the handle is depressed. The Big Max 500G torch is the only torch with a molded handle, which is trademarked, for better control and comfort and the long handle keeps you from bending over. The Big Max comes fully assembled and ready to use. The Big Max uses standard LP tanks (up to 40# tanks).