part of the quest to make battery watering as easy as possible, ROVER
& ROVER developed a unique combination of coupler, valve, strainer,
and flow indicator in one durable polycarbonate unit (R&R patent).
In addition, the male coupler acts as a Y-Splitter. Installation of
the All-In-One Coupler saves time and money by eliminating the need
to struggle with multiple connectors and flow indicators. Not All-In-One
All-In-One Coupler is easier to use too, because there is no thumb latch
to press or slide to push--just snap-in and snap-out. Even
the flow indicator is special! Visible from 360 degrees, the yellow
spinning balls signal that water is entering the cells. When they stop
spinning, it means that all cells have enough water and the watering
procedure is finished! The large surface area of the incorporated strainer,
when used under normal conditions, guarantees the coupler will last
for multiple battery lifetimes.