An aggregate replacement device may be used to take replace rock aggregate in underground drainage systems. An aggregate replacement device may include a structure having a proximal end, a distal end, and at least one face. The at least one face may have a plurality of first openings. A second opening in the structure may extend from the proximal end to the distal end of the structure continuing uninterrupted through at least one of the at least one faces. The second opening may receive a pipe inserted in a radial direction of the pipe. The aggregate replacement device may also include a pipe retainer. An additional embodiment of the aggregate replacement device may include a stake which may be used to secure the aggregate replacement device in position.