157B202MX9001 2kΩ Rotary Potentiometer 1-Gang Panel Mount. Vishay offers its high quality, Model 157, 7/8” (22.2 mm), precision industrial potentiometers with a rugged one piece metal housing. These potentiometers are available in servo- and bushing-mount versions with an optional sealed construction (bushing-mount only). The Model 157 potentiometers feature a long rotational life and a wide operating temperature range.