Inside a urinal auto-syphon.

I've always wondered what's inside the syphon assemblies used to flush the urinals in UK public toilets on a regular basis. I thought it would be a simple syphon with a pipe up the middle and an outer dome, but it's MUCH more complicated than that.
This device must have other applications too. From providing splashes of water in water-play areas to ebb and tide style hydroponic systems.

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Видео Inside a urinal auto-syphon. канала bigclivedotcom