The extension part is double-walled with an external and inner walls. The distal front surface exhibits a fixing element. The extension and filter part (12) exhibits a circular cross section. A circulating bulge is arranged on an outer circumference surface (38). The overall length of the inner wall is smaller than the overall length of the external wall. A circular cavity is formed between the external and inner walls. The filter part exhibits retaining federation at its proximal end. Bars in the filter housing exhibit a stabilization element. The retaining federation exhibits a circulating retaining bulge at the outer circumference surface. A relief valve is held by the retaining bulge. The filter body exhibits a central drilling.
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