This is something that we have found to be really handy when filling up our fresh water tank or when flushing the black tank. Don't worry, we have two different in-line water meters for each of the mentioned applications, LOL!
It's pretty much a guessing game when filling up the freshwater tank unless it is completely empty. We would rather fill up to almost full rather than let it overflow and potentially cause a suction and draining water from the tank.
It works great every time when flushing the black tank. We can fill up to whatever number of gallons and drain no problem.
Anyway, thought we would share!
