The Spray Arm is an OEM replacement part for Whirlpool dishwashers. It is a component responsible for distributing water through an array of small spray openings during the cleaning cycle. The spray arm rotates and evenly disperses water and spray over the dishes. Causes of a bad spray arm can include mineral scale buildup obstructing water flow through the spray holes, damage or cracking weakening the plastic construction, or worn bearings preventing proper rotation. Symptoms of a bad spray arm include: Inadequate or uneven cleaning even on lightly soiled dishes Dirt and food particles left behind after washing Clogged or inoperable spray holes. This OEM Whirlpool replacement part is also compatible with Maytag, KitchenAid, Jenn-Air, Amana, Magic Chef, Admiral, Norge, Roper, and some Kenmore models.Part Number WPW10320512 (AP6019450) replaces 8579263, W10195665, W10234638, W10320512, WP8579263, 4444824, PS11752757, W10084401, W10084508.