Concealed and embedded assembly

The invention discloses a concealed and embedded assembly, which comprises a lower main body, an embedded box and a water test piece, wherein the lower main body is provided with a cold water inlet flow passage, a hot water inlet flow passage, a mixed water flow passage and at least one water outlet flow passage, and the cold water inlet flow passage, the hot water inlet flow passage, the mixed water flow passage and the water outlet flow passage are respectively provided with an inlet and an outlet; the embedded box comprises a box body and a fixed frame which is used for holding the box body, and a cold water hole, a hot water hole and at least one water outlet are formed in the side wall of the box body; the bottom surface of the water test piece is provided with a first passage and a second passage; the lower main body is held in the box body; the water test piece is held in the box body and is arranged on the lower main body in a covering to communicate the water outlet flow passage and the mixed water flow passage with the cold water inlet flow passage or the hot water inlet flow passage. Since the lower main body is held in the box body, is separated from cement and is quite convenient to disassemble, assemble and maintain. The embedded box can be shared by shower, bathtub and wash basin type temperature-controlled, electronic and single-handle products. The application scope is wide.