Oh I see ..let me explain.

I was simply showing that the level can be "set" but once it is set the auto siphon
mode works. I was using a clamp just to hold hose so it did not slide in once I
picked a level I wanted. Does this make sense?

So yes once the hose is set then it will seek that level then as it reaches it the water
will flow and will not stop until the air is sucked in behind it.

And yes I made one the same way with 3 tubed...let me take a picture of that. It is not
mounted to a res but I can show the way it looks. WOW hands are frozen here I forgot
to shut the door to shop and it's 31/F..heater is on high now...I do not like winter!

brb with picture