The Lower Spray Arm is an OEM part for Bosch dishwashers. This part is responsible for spraying water and detergent solution onto the dishes during the wash cycle, ensuring thorough cleaning. Causes of a malfunctioning Lower Spray Arm can include clogging or obstruction from food debris, mineral buildup, or foreign objects.   Symptoms of a bad Lower Spray Arm include: Poor cleaning performance, with dishes coming out dirty or with food particles remaining Water not spraying evenly or failing to rotate during the wash cycle Loud grinding or knocking noises coming from the spray arm area This genuine OEM Bosch part is also compatible with Thermador, Gaggenau and select Kenmore models.Part Number 00359975 (AP2802425) replaces 359975, 916450, AH3453849, EA3453849, PS3453849, PS8704488.