The 00359976 is a genuine OEM middle/center spray arm assembly for Bosch, Thermador, and Gaggenau dishwashers. This wash arm is a critical component that rotates and sprays water to clean dishes in the middle rack of the dishwasher. The assembly is constructed from high-quality, durable plastic material designed to withstand continuous exposure to hot water, detergent, and high water pressure. The spray arm measures approximately 14-16 inches in length and features multiple spray nozzles (typically 8-12 nozzles) strategically positioned along the arm to provide optimal water coverage across the middle dish rack. The spray arm includes a center mounting hub with a snap-lock mechanism that attaches to the middle rack support, allowing the arm to rotate freely during the wash cycle. The spray nozzles are precisely angled to direct water jets upward and outward to reach dishes, glasses, and utensils on the middle rack. The arm rotates using water pressure from the circulation pump—as water flows through the arm and exits the nozzles, the reaction force causes the arm to spin, ensuring even water distribution across all dishes. The 00359976 assembly includes the spray arm body, spray nozzles (molded into the arm), center mounting hub, and lock nut for secure attachment. Over time, dishwasher spray arms can fail or become less effective due to mineral deposits and hard water buildup clogging the spray nozzles, food particles and debris blocking water flow, physical damage from impact with dishes or utensils, warping or cracking from heat exposure, worn or damaged mounting hub preventing proper rotation, broken or missing lock nut allowing the arm to detach, or manufacturing defects. When the spray arm fails, symptoms include dishes on the middle rack not getting clean, food residue remaining on dishes after wash cycle, glasses and cups with water spots or film, the spray arm not rotating during wash cycle, visible cracks, breaks, or warping on the spray arm, water spraying in wrong direction or not spraying at all, the arm falling off or becoming loose during operation, or unusual noises during wash cycle (rattling, banging). The 00359976 is a complete replacement spray arm assembly that restores full cleaning performance for the middle rack. Replacing a faulty spray arm eliminates all spray arm-related cleaning problems and restores reliable dishwasher operation. Important: This is the middle/center spray arm for the middle dish rack only. It is NOT the lower spray arm (bottom of dishwasher) or upper spray arm (top rack). Verify your dishwasher model number matches one of the compatible models before ordering. Note: This part has been discontinued by the manufacturer and may no longer be available from Bosch. Alternative replacement options may be required.