Cast ceramic refractory stopper

Cap casting, refractory ceramic, comprising: a) a cap body casting shaped rod (12) defining a central longitudinal axis of Decolada cap (A) and b) at least one supply conduit for gas (16 ), extending inside said deltapon body casting (12) to a plug head casting (14), wherein c) said at least one feed line for gas (16) is fused to a channel cylindrical gas (38) within it, d) extending said channel cylindrical gas (38) concentrically to the central longitudinal axis of Decolada plug (a) inside the plug head casting (14) towards its free outer surface .