Installed a universal battery watering system for four Trojan brand T-105 6 volt deep cycle batteries.
The kit comes with clear tubing that you cut to length and an attachment for a hand pump (not in kit) to deliver water only to the battery cells needing to be filled.
This customer was first interested in purchasing AGM/Gel maintenance free 6 volt batteries but because they are double the price, the better solution was to utilize a watering system.
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Installing Battery Watering System for RV