... thermostatic expansion valve 2,brass body,ABS surface 3,digital,smart 4,keep the temperature of outcome water constant thermostatic expansion valve ... source4PCS NO.5 batteryPackingColor cartonThe features of the thermostatic expansion valve:1,The thermostatic mixer has three buttons: on ... -off key, temperature up key, temperature down key.2,The thermostatic mixer has a target temperature button and ...