Anyone have a diagram for a latching system?

[Origami]

I gotta be honest, I didn't invent this. But I thought it was a great idea too- good enough that I was able to actually remember it... I plan to make one of these myself as part of my redo. One other things- the "inner tube" really doesn't have to be anything fancy. It can essentially be a PVC pipe. It just needs to be big enough for the float switch and check valve.

 

Yes, if the check valve fails the apparatus doesn't work but it wouldn't be a catastrophic failure. Worst case, your RO/DI cycles more. Water will still be available for top off and nothing floods. That was one of the elegant aspects of this.

 

Agreed. I thought the same thing - just a simple PVC pipe. Maybe a threaded adapter at the top and a plug that you can mount the float to, yet still get at it if you need to. Pretty cool.