When you look inside the filler opening, down at the bottom you will see a notch from the bottom that is about 1/4" long. That is a notch to allow any gassing to escape, liquid level should be between the bottom of the notch/filler tube after adding water. Westinghouse Electric Corporation used de-ionized water in their fork truck batteries, not distilled.
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2000 Winnebago Ultimate Freedom USQ40JD , ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG 11B5MX,Infantry retired;Good Sam Life member,FMCA. " My fellow Americans, ask not what your country can do for you, ask what you can do for your country. John F. Kennedy
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