The Center Spray Arm and Tube Assembly is an OEM replacement part for Bosch dishwashers. This assembly features a rotating central spray arm attached to a feed tube. During wash cycles, water and cleaning solution pump through the tube to eject forcefully from spray holes positioned across the fixed and rotating arms.  Causes of failure include mineral deposits clogging spray holes over time or tubes developing cracks from prolonged high-pressure usage. Bearings within arms may also experience normal wear. Symptoms of a problematic assembly are: Reduced or uneven spray coverage inside the tub Dirty dishes clustered in certain areas post-wash Loud noises or grinding from spray arm movement Spray jets that do not rotate or eject water as designed This is also compatible with Thermador, Gaggenau and some Kenmore models.Part Number 00298594 (AP2802423) replaces 00350644, 298594, 350644, 916349, PS8703130.