My first cart didn't have the fill system. I had to fill once a month. No big deal. I bought a new to me cart and it has a fill system. Real nice. Water doesn't evaporate so i only fill maybe every three months. It has a wheel in the supply line, be sure you unplug as soon as the wheel starts to slow or it can overcome the floats and overfill the cells. I would not be without it.
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