Trident Propane Tank Cylinder, composite, 17 lb. capacity. See-through LPG Tank. With new advances in technology, comes a transparent composite cylinder with some amazing advantages over traditional cylinders. The gas level is visible thanks to the special see-through construction and when empty the cylinder weighs about 50% less than typical steel cylinders. The cylinders are suited to all kinds of use, from boating, camping and picnicking to barbecues and patio heaters, as well as normal domestic uses such as cookers and stoves. Easily portable and attractively designed, these are the LPG cylinders of the 21st century. Features: Will never rust; Visible propane level; Half the weight of a steel tank; Can be refilled anywhere in the US.