A flow splitter includes a body having a generally cylindrical main passage therethrough oriented along a longitudinal axis of the body. The main passage connects an inlet at the upstream end to exactly three split passages adjacent the downstream end, each split passage connected to a corresponding outlet. A first and second of the three split passages are oriented along axes that intersect one another at a first acute angle in a common plane with the longitudinal axis. A third of the three split passages intersects the common plane at a second acute angle. An agricultural implement includes a frame, a toolbar carried by the frame and supporting a plurality of row units, a hopper carried by the frame, a primary flow line connecting the hopper to a flow splitter, and three secondary flow lines connecting the flow splitter to three of the row units.