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I've seen those in use before (or something similar at least) and they work well, assuming that the bleeder nipple is good and the hose has a good grip onto it. I've had "self bleeder" kits where the tube is not as tight as is needed and it allows air to bleed back in. I think good tubing and bleeders are key to this.
I worked in a Honda dealership and the techs flushed brake systems all the time.
They just put the hose into a gallon jug filled about 1/3 of the way and they knew how many pumps it took to bleed each wheel cylinder on every car they worked on.
My wife is my assistant Ruiranch, is not that your assistant in the photo?
I need to teach you guys the trick of drilling a hole in an old master cylinder cap (2 holes in the older dual reservoir caps)
That way you can use a bit of low pressure shop air to bleed the master cylinder and all 4 brakes with 1 man in 5 minutes
Same principle as using an old EIS or Snap-On pressurized fluid brake bleeder, without all the mess
I have a pressure bulb the size of a big basketball which I fill with brake fluid. There's a brake fluid reservoir kit which has reservoir caps. The kit covers most reservoirs and has a quick disconnect line on it. The bulb gets charged to ~15 psi, the proper cap installed and you work your way around the vehicle. Works like a charm and as the bulb holds about 3 litres of fluid, is pretty efficient.