Abstract: A cementing apparatus includes a readily transportable chassis, such as that of a convention cement truck or a trailer, a rotatable mixer, a holding tank for receiving material extruded from the mixer, a pump that receives and pressurizes material from the holding tank, and an outflow conduit for directing the pressurized material to a desired location. The cementing apparatus may also include a fluid inflow system for pressurizing and directing fluid from an external source into the mixer. In addition, a valve may be positioned at an appropriate location to shut off the flow of material from the mixer through the outflow conduit and to cause fluid from an external source to flow through the outflow conduit. The apparatus may be used to mix and pump cement slurry into a drill hole through an outflow conduit and to pump displacement fluid into the drill hole through the same outflow conduit.