The Reflector is an OEM part for Whirlpool microwaves. It is located inside the microwave cavity behind the waveguide and works to redirect electromagnetic waves for more even cooking.   Symptoms of a damaged reflector include: Inconsistent or incomplete heating of foods during cooking Hot and cold spots forming within the microwave cavity Lower overall power output from the microwave Causes of reflector damage can be cracking or pitting of the reflective aluminum surface over multiple heating cycles. Impact incidents from user error may also damage its shape. This OEM Whirlpool replacement assists in delivering uniform energy distribution for optimal microwave performance. This part is also compatible with Maytag, KitchenAid, Jenn-Air, Amana, Magic Chef, Admiral, Norge, and Roper microwave models.W10240330 (AP4372897) replaces W10210873, 1482659, PS2349147.