Sit implement divide again from working principle fall to rush type and siphon type, and siphon type fractionize falls to rush siphon type, eject siphon type and vortical siphon type.

• 坐便器从工作原理上又分为冲落式和虹吸式，而虹吸式又细分为冲落虹吸式、喷射虹吸式和旋涡虹吸式。