Battery watering system for flooded batteries
I have an semi-automatic battery watering system from a decommissioned flooded battery system. It's made by Battery Watering Technologies and includes replacement cell caps that have built-in floats and shut off valves. You feed them water via plastic tubing and it tops up all the cells to the proper level. It's a real time saver, especially if you batteries are difficult to access. The caps fit Trojan and Surrette batteries, and probably others. I used this system for about 2 years.
I have 24 caps/valves, plus a squeeze trigger fill valve with flow indicator. Normally sells for $340, asking $125
Additionally I have a water deionizer that filters tap water and makes it suitable for use in batteries. Normally sells for $350, asking $100.