It took nearly 8 years, but finally Steve Mould has built a 2D cutaway model of a self-priming #syphon
https://youtu.be/XjQc8Bf0UlM
that explains why there was a surprising number of parts inside the one Bigclive took apart here
https://youtu.be/BQ45kMi6HkA
(At 6:00 Bigclive mentioned he wanted to see one in clear plastic)
#physics #urinals #AutoSyphon