Abstract: This apparatus includes a hopper large enough to hold material to fill a number of cavities which are backfilled to produce columns in soil by first advancing a hollow shaft attached to the hopper into the soil and flowing sand from the hopper through the shaft and into the cavity formed as the shaft is withdrawn. The material flowing from the hopper through the shaft is stopped after each column is filled by closing a valve in its flow path. The equipment is moved to the next location in the area point without having to fill the hopper, which saves time and avoids waste of material. When sand is the material, the hopper is pressurized to cause the sand to flow, as in the installation of sand drains used in making wet soils safe for the support of construction.