Viking Cylinders 17lb Vertical Fiberglass Composite LPG Cylinder w/Type 1 Valve - OPD, DOT, TC Approved [1420-0017]17lb Vertical Fiberglass Composite LPG Cylinder with Type 1 Valve OPD, DOT, TC Approved This composite propane tank has an internal bladder encased in fiberglass, which allows users to see the gas level. The propane construction also means this cylinder is lighter than a standard steel cylinder. Features: Non corrosive 3 layer fiberglass composite cylindrical Ergonomic collar for a nice look The handle makes it easier to carry Type 1 valve Frequent