If you are a camper van, you know that most chassis maintenance items are in hard-to-reach places. This was a problem I had when maintaining fluid levels in both the chassis battery and home batteries. I saw this device and decided to try it, it works exactly as advertised by the company. You can connect one or more batteries to the system. You will need a pump set to transfer distilled water from the jug to the batteries, this is a separate purchase. There was more than enough tubing to run the batteries and pump from the jug to the batteries. No special tools are required for installation, the instructions are quite simple, and once the device is installed, there is no need to open filler plugs in impossible places. Maintenance is all about a motorhome and everything that makes it easy for me. *I'm pretty sure it should NOT be used to pump acid or other dangerous liquids*.