TARIC 7311.00.30.80 — Refillable high-pressure cylinders, of steel, of a capacity greater than 120 ml, of all diameters and volume capacities, whether or not threaded, whether filled with a porous mass or not, regardless of internal coating or plating, regardless of external finishing and shape, whether or not with a gas bladder inserted, regardless of the cylinders' fitting with a valve, neck ring, foot ring or piping, whether or not fastened together to form a bundle