Yes I use the FlowRite system. I have it on my 2 trolling batteries as well as my cranking battery. On the trolling batteries since they sit next to each other, I hooked them together and can fill both at one time. The water simply fills the first battery then runs over to second one. Very easy to install. Just remove old caps and insert new vented caps. Then cut tubing to connect everything. When wanting to add water, simply insert the bulb and tubing into a jug of distilled water, hook to the fill tube and pump water from jug to batteries. When done cap off the fill tube. The kit seems a little expensive, but the convenience makes up for it, in my opinion. I had to buy two kits in order to do both trolling batteries and cranking battery.