otherwise to frictionally secure wire 65 therein it is certainly recognized that wire 65 may be attached by numerous means known in the art and various occlusion means serving an equivalent purpose to wire 65 may be employed one such equivalent occlusion means would involve forming the lower region of filter chamber 50 which in the preferred embodiment also functions as outlet port 34 to have an outer diameter which may be larger than the cross sectional size of filter element and an inner diameter smaller than the cross sectional size of filter element 60 and having a perimeter of a shape which does not correspond to the shape of filter element 60 for example lower region of filter chamber 50 which is preferably outlet port 34 could be formed having a serrated perimeter such that the teeth extend into outlet port 34 to provide an inner diameter as measured between the points of opposing teeth which confines filter element 60 while air and pulverulent material could pass through the gaps found between the teeth of the serrated perimeter in operation the invention 10 is installed in a tire wheel rim 20 using the same methods as would be used to install a conventional tire valve stem a tire is.