The Flame King 1 pound (16.4oz) refillable propane cylinder is legally and lawfully refillable and transportable, just like your BBQ tanks are. Our unique and patented valve design is not available from any other manufacturer. These refillable propane cylinders are perfect for practically every Mr. Heater, Weber, Coleman and similar outdoor type applications that would fit a disposable 1 pound cylinder. Spend your money wisely and buy the last 1 pound propane cylinder you will ever need! Using a single-use 1 pound disposable cylinder is just a waste of resources and has a serious environmental footprint problem. Join the eco-revolution! Made of high grade steel construction, the cylinders are hydrostatic tested and powder coat painted for long lasting exterior protection. They are DOT & TC certified for 12 years (10 years in Canada) of continuous use. The valve is tested to the UL1769 standard. The 1 pound Refillable cylinder is only compatible with the Flame King propane refill adapter