This is a replacement middle spray arm in your dishwasher. You will find your middle spray arm mounted on the bottom of the middle dish rack. The upper spray arm rotates and sprays water during the operating cycle. If your dishes are not coming out of the dishwasher clean, you may have a malfunctioning middle spray arm. Debris and hard water buildup in your dishwasher can cause the middle spray arm to clog. To replace the spray arm, simply turn the arm counter clockwise to release it from the dish rack. Screw in the new spray arm to complete the repair. This part is sold individually.