An agricultural row unit includes an attachment frame adapted to be rigidly connected to a towing frame, and a linkage assembly pivotably coupled to the attachment frame to permit vertical pivoting movement of the linkage assembly relative to the attachment frame. The row unit further includes a hydraulic actuator coupled to the linkage assembly for urging the linkage assembly downwardly toward the soil, and a hose connection manifold mounted adjacent to the hydraulic actuator for circulating hydraulic fluid between a hydraulic source and the hydraulic actuator. The hose connection manifold has a modular port for accepting, one at a time, a removable control valve and a port plug.
