Hydraulic attachment (1) for a carrier device, in particular an excavator or wheel loader, which can be mechanically connected to the carrier device through a receptacle (2) and hydraulically, characterized by a receptacle (3) for flowable building materials, in particular concrete, with an inlet opening (4) for filling in the flowable building material and with a metering opening (5) for discharging the flowable building material, the metering opening being controlled by a hydraulic opening drive (6) to enable hydraulic opening and closing, the hydraulic opening drive being connectable to the carrier device, and can be controlled by the latter, and the position of the attachment can be changed by means of the receptacle, so that the flowable building material can flow out of the metering opening in a controllable manner in terms of quantity and speed.
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