Patent ID: 8225819

Claim:
A vent assembly comprising: a base portion coupled to a tank, the base portion defining a vent passage in fluid communication with a storage chamber of the tank; a float member coupled to the base portion for movement relative to the base portion between a first position and a second position, the float member movable from the first position to the second position in response to an increase in fluid level within the storage chamber, the float member closer to the base portion in the second position than in the first position the float member includes a flat upper surface abutting the base portion in the second position to seal the vent passage; a cap releasably securable to the base portion such that the cap operates to close the vent passage when secured to the base portion, the cap removable from the base portion independent from the float member; and a shaft received in a channel defined by the base portion, the shaft completely through the base portion, the channel separate from the vent passage, the float member secured to the shaft; wherein the vent passage remains open for venting the storage chamber when the float member is in the first position and wherein the float member seals the base portion in the second position to prevent fluid communication between the storage chamber and the atmosphere through the vent passage.