worn the blowing element to such point the tip of said metallic pipe 5 is welded by the high temperature of the liquid metal when the fluid supply is stopped making it impossible to continue using the blowing element beyond this safety point and making imperative the replacement of blowing element a long enough length of metallic pipe 5 is left to avoid leaks of liquid metal said blowing element inserted in said wear resistant block 1 and fixed to it by means of a flanged metallic base 6 fixing clamps 11 and wedges 10 said wear resistant block 1 fabricated using ceramic powder isostatically pressed into a mould near shaped to the truncated cone shape having a cylindrical hole running along the central axis of said wear resistant block 1 to allocate said blowing element said wear resistant block 1 having a flanged metallic base in the cold face 6 is used as means to allow the extraction from the ceramic sleeve 15 and to support said blowing element fig1 also represents the injection device installed the bottom of a metallurgical vessel said ceramic sleeve 15 is surrounded by working refractory bricks 16 and safety lining refractory bricks 17 a refractory castable mix 18 is used to adjust and fill between said ceramic sleeve 15 and the metallic shell 12 besides the long life characteristic present in the injection device object of this invention its design allows the use of the following method for a quick replacement which also is an object of the invention the blowing element is designed for easier extraction from the wear resistant block 1 the.