Watering device for batteries

A watering device for maintaining a predetermined electrolyte level in a cell, the device having a central axis and comprising a plug body having a cover and a valve chamber disposed within the plug body, a valve disposed within the plug body, the valve including a valve head, the valve head disposed within the valve chamber, the valve chamber including an upper valve seat and a lower valve seat, an O-ring circumscribing the valve head, the O-ring movably disposed between the upper valve seat and the lower valve seat to create a positively closed and a positively opened valve position respectively, means for introducing water into the valve chamber, means for introducing the water from the valve chamber into the cell, means for permitting gas to exit from the cell, and float means in movable communication with the valve and the electrolyte.