Ya Paul, your right, with a vent hole, it may need a fill hole at the "over the tank" section. When he filled it in the video, with no hole, it got a full suction, and because there was no vent to break suction when tank got to level, it continued to siphon untill the inlet got uncovered and broke the siphon that way.
Steve, it may not start with the cap removed like I suggested because there will not be water in the over the tank bend to start with. This needs to be full and no air in it in order to create the siphon from the tank. Then, the air inlet at the T, that makes it so the siphon will stop, when tank reaches that level, but the over the tank pipe remains full of water
I hope I'm not confusing you, I can see it clearly in my head but seeing and describing are 2 different animals LOL
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Dan Pesonen
Umm, a tank or 5
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