PURPOSE:To enable easy decision of a residual thickness and to prevent leakage of a molten metal by providing a recess to the bottom of a porous brick body and fitting a slave porous brick having larger air permeability than that of said body into the recess. CONSTITUTION:A recess is provided to the bottom of a porous brick body 1 which is provided on one surface of the lining applied to a vessel for a molten metal and supplies gas into the molten metal in the vessel. A slave porous brick 2 having larger air permeability than the body 1 is fitted into said recess in the state of packing mortar 3 between the side face thereof and the body 1. A gas soaking zone 4 is provided between the top surface of the brick 2 and the body 1. The sectional area ratio between the body 1 in the top surface position of the brick 2 and the brick 2 is made in a 2:1-25:1 range.
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