The invention relates to a flush-mounting installation device for single-lever mixing taps, comprising an outlet (5), which is connected to a mixing chamber in a cartridge (6), to which cartridge a hot-water and a cold-water connection (2, 3) are connected and which is arranged in a main body (1), wherein the supply from the hot-water and cold-water connections (2, 3) can be controlled by means of the cartridge (6).
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