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A fillbox system to prevent water from entering the below ground level inlet of an input stand pipe for an underground fuel storage tank. The system includes a fillbox about the inlet stand pipe which extends upwardly therein and a fillbox cover having a downwardly extending skirt which extends almo

A fillbox system to prevent water from entering the below ground level inlet of an input stand pipe for an underground fuel storage tank. The system includes a fillbox about the inlet stand pipe which extends upwardly therein and a fillbox cover having a downwardly extending skirt which extends almost to the bottom of the fillbox. The skirt, generally has the same outer shape as the inner sides of the fillbox but a slightly smaller dimension than that of the fillbox adjacent the cover. The skirt has a small inward draft angle as it extends downwardly about the stand pipe so that when placed on the fillbox, the cover is guided by the skirt into a proper seating relationship. At the same time, the skirt and cover trap enough air therewithin so that the level of water seeping in the fillbox can never exceed a volume that would produce a water height above the inlet with the cover removed to leak into the underground storage tank when the inlet is opened.

대표청구항 ▼

A fillbox system for preventing undesirable liquid contamination of an underground inlet of a fluid storage tank by liquid accumulated above a ground level within the fillbox and below said inlet, said system including: a fillbox cover plate adapted for closing off a fillbox upper opening and having

A fillbox system for preventing undesirable liquid contamination of an underground inlet of a fluid storage tank by liquid accumulated above a ground level within the fillbox and below said inlet, said system including: a fillbox cover plate adapted for closing off a fillbox upper opening and having a lower surface and an outer edge surface; and a 360°skirt depending from said lower cover plate surface spaced inwardly from said outer edge surface, said cover plate lower surface and depending skirt being configurated and sized to cooperate with said liquid accumulated above said ground level to define a space within which to trap such a volume of air therein when positioned about the inlet as to prevent sufficient liquid from accumulating within the fillbox above said ground level therein to overflow the inlet when said fillbox cover plate and 360°skirt are removed.