a water housing having a water inlet cavity , a faucet cavity and a shower connection . a stem with a control head is slideable between the shower connection , the water inlet cavity and the faucet cavity . the stem control head has a set of two lower water passages and a set of two upper water passages which respectively control flow of water into the shower connection and the faucet cavity , depending on their vertical orientation . the upper end of the stem is stabilized by a sleeve cover , which also serves to support and guide a handle . the handle is pulled straight up and down , but can also be snapped in place by means of a spring - loaded steel ball and a concavity on the stem .