I've never seen a siphon flush toilet in the US, only drop valve toilets. A siphon design looks like this: https://en.m.wikipedia.org/wiki/Flush_toilet#Siphon-f

I've never seen a siphon flush toilet in the US, only drop valve toilets. A siphon design looks like this: https://en.m.wikipedia.org/wiki/Flush_toilet#Siphon-flush_mechanism https://en.m.wikipedia.org/wiki/Flush_toilet#Siphon-flush_me...