I LIKED YOUR BATTERY WATER FILLER. I ADDED A THEXTON #604 ACTIVATOR BATTERY FILLER ($21)IT HAS A POSITIVE THUMB RELEASE VALVE AND A CELL EYE THAT SHOWS WHEN THE CELL IS FULL. FORGOT TO SAVE YOUR E-MAIL ADDRESS. i BOUGHT THE FILLER FROM NAPA AND THE PART # IS 700-1164. CARL