I came upon an item a few months ago by watching a video bloggers house build on Youtube here in Thailand. At our place the old way to fill the water tank was to run a groundwater pump until the water tank was full then turn it off, this was wastefull and annoying if you ever forgot to fill the tank.
Then we got metered water, is a lot cleaner and less minerally. So I decided to connect it to the tank and then got one of these,
to stop the need to turn a valve everyday.
It lasted about 9 months and letting water overflow, so pulled it out and reversed the rubber in the valve, and lasted about another year, is pissing water again. It is a pain to remove because of how the pipeing here is all glued pvc, and the location inside the tank means i have to cut the pipe for removal.
And you can't buy new rubbers, everywhere i went said No, you have to buy a new unit. I asked about this small valve and only one shop new about it but did not know where to get it,
Then finally i found it in Global House, comes in 3 sizes, 1/2, 3/4 and 1 inch. easy to screw off when installed inside the tank and easy to pull apart to clean. And made in Thailand.
I will update whenever it fails or if it becomes useless, but here is hoping.