seal between said filler neck 12 and said cylindrical wall 20 of the filler neck closure 52 in the closed position the breather vent container 54 consists of a cylindrical downwardly open cup 70 having a cylindrical recess 72 concentric with the former 39 s axis and a hole 74 in its horizontal base also concentric with said axis and a plurality of apertures 76 formed in its lateral wall a cylindrical cross sectionally 34 l 34 shaped member 78 having a solid vertical on top outwardly flared wall portion 80 and a perforated horizontal annular wall portion 82 are lodged inside said cup 70 in such a manner that the upper edge 83 of the wall portion 80 adheres to the vertical wall of said recess 72 whereas the outer edge 84 of said perforated annular wall 82 is crimped along its periphery within the bottom flange 85 of the wall cup 70 the inside diameter of the cylindrical vertical wall portion 80 is of such a dimension as to provide a force fit and a seal with the outside of the cylindrical wall portion of said cup 56 a shell 86 having the shape of an inverted truncated cone and a cylindrical extension 88 formed at its lower edge is crimped along its top periphery together with said outer edge 84 of said annular perforated wall 82 into said bottom flange 85 of said cup 70 the inside diameter of said cylindrical extension 88 is of such a dimension as to provide a force fit and a seal with a second 34.