Concealed embedded component for a waterway system

A concealed embedded component for a waterway system in a structure, comprising:

• a lower main body including a cool water inlet passage;
• a hot water inlet passage;
• a mixing water passage;
• and at least an outlet passage, the cool water inlet passage, the hot water inlet passage, the mixing water passage and the outlet passage being respectively provided with an inlet and an outlet;
• an embedded box comprised of a box body;
• and a fixing frame covering the box body, a side wall of the box body being provided with a cool water hole;
• a hot water hole;
• and at least an outlet hole;
• a water testing element having a bottom surface provided with a first passage and a second passage,
• wherein the lower main body is disposed in the box body, the inlet of the cool water inlet passage is aligned with the cool water hole, the inlet of the hot water inlet passage is aligned with the hot water hole, the outlet of the outlet passage is aligned with the outlet hole, and
• wherein the water testing element is disposed in the box body, the water testing element covers the lower main body to constitute said outlet passage, and the mixing water passage is connected to the cool water inlet passage or the hot water inlet passage.