This part is located between the drum support rollers and idler pulley in your dryer to help prevent the parts from bumping up against the brackets they are attached to. If your dryer has a burning smell, is noisy, or will not tumble, you may need to replace the thrust washer. The washer is 3/4 inches in diameter and a is genuine OEM part. It is recommended to disconnect the power to your dryer before you start your repair.