This is WXD3-13-2W 4.7K ohm Precision Potentiometer, widely used to adjust the timer, speed, and temperature.
 Features: 
 - Model: WXD3-13-2W
- Small size, easy to carry
- Provide full protection from dust, shock, scratches and bumps, and other daily damage.
Package Includes: 
 1 x WXD3-13-2W 4.7K ohm Precision Potentiometer