Question: what is the difference between two-piece agitator or impeller?
Answer: Traditional agitators are tall spindles, vaned or finned, in the center of the wash basket that twist (or agitate) back and forth, rubbing against clothes to help break down loose soils. Impellers, on the other hand, are low-profile cones or discs that spin/rotate to rub clothes against each other to get them clean.