The periphery of the arc hot/cold water inlet holes 421, 422 and the water outlet hole 423 of {TAIL ~ the lower switch valve} 42 thereof are defined by {HEAD ~ indented groove seats} 4211, 4221, 4231 respectively, correspondingly matched to higher protruded walls 4011, 4021, 4031 defining the arc hot/cold water inlet passages 401, 402 and the water outlet passage 403 of the valve mount 40 thereof respectively 
The periphery of the arc hot / cold water inlet holes 421 , 422 and the water outlet hole 423 of { TAIL ~ the lower switch valve } 42 thereof are defined by { HEAD ~ indented groove seats } 4211 , 4221 , 4231 respectively , correspondingly matched to higher protruded walls 4011 , 4021 , 4031 defining the arc hot / cold water inlet passages 401 , 402 and the water outlet passage 403 of the valve mount 40 thereof respectively
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