Deep cycle Battery vent-hose adapter
thingiverse
This adapter swaps out standard vents on deep cycle batteries with 3/4-inch holes for refilling cells and 1 5/8 spacing between them. It allows you to hook up a 3/8-inch ID hose directly to the battery for outside venting, and connect multiple batteries together in a single setup. Mouse ears on either side make it super easy to remove and install.
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