Blow-to-start siphon (venturi effect) - REMIX for 15mm - 16mm pipes
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Modification to accommodate pipes bigger than the original design 14mm.
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- Other House Equipment
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In the original model there is only one mention of which way round to use it, and it's deep down in one of the comments. Apparently the marked route on the outside of the device is the FLUID channel for startup, so blow into the OTHER entry, although as per the video you can then put that pipe in the fluid as well if you want to once it's started ok.
The basic Venturi principle is there, and for VERY high fluid level it does actually work. The problem is that humans can only blow so hard, and with this particular Venturi that's only going to translate into a vacuum pressure of about half an inch of water, so the vessel you're draining needs to be pretty much brim full or you can't get enough puff in there to get the fluid "over the hump".
After trying just with me blowing into it, I decided to see just how much more vacuum could be achieved with compressed air, as I have a 100psi compressor. This Venturi has quite a large air hole so my compressed air wouldn't have been anything like 100psi at the critical spot, but it did achieve a vacuum of roughly 12" of water so if I needed to empty a vessel with the fluid level up to a foot below the rim then using the compressor to start it would be a possibility :o)
Alternatively, the following model uses a shaker/rattler design instead of a venturi, and I've found it works really well for emptying tanks like toilet cisterns and open hot water expansion tanks...
https://www.printables.com/model/833171-shaker-siphon-for-garden-hose