The Lower Dishwasher Rack Assembly is an OEM part for Whirlpool dishwashers. This part holds and organizes dishes, pots, and pans in the lower section of the dishwasher, ensuring they are properly positioned for effective cleaning. Causes of a bad lower rack can include wear and tear from regular use, exposure to harsh detergents or high temperatures, and physical damage from heavy or improperly loaded items.  Symptoms of a bad lower dishwasher rack assembly include: Rust or corrosion on the rack Broken or missing tines Difficulty sliding the rack in and out Poor arrangement of dishes, leading to ineffective cleaning This OEM Whirlpool part is also compatible with Maytag, KitchenAid, Jenn-Air, Amana, Magic Chef, Admiral, Norge, Roper and some Kenmore models.Part Number W10311986 (AP4512509) replaces W10380384, 1557748, 3-993, 3368312, 3368519, 3368612, 3370545, 3382191, 3382192, 357442, 569204, 569238, 675132, 710404, 710770, 710914, 711156, 711353, 711468, 711708, 711997, 711998, 712444, 712993, 713238, 713346, 713727, 713757, 714182, 714898, 714899, 715300, 716036, 716095, 718131, 718303, 718384, 718722, 718723, 719328, 719972, 719973, 8051108, 8051109, 8051723, 8051873, 8051876, 8193771, 8268708, 8519582, 8561713, AH2378335, EA2378335, PS2378335.