The 51CAD-E24-B13L is a sealed 1/2" (12.5 mm) square potentiometer control manufactured by Bourns, designed for professional audio and general control applications. This model features a conductive plastic element with linear taper and ±10% tolerance, supporting resistance values from 1 kO to 1 megohm. The potentiometer is sealed for board washing, includes a metal bushing and shaft, and is available in both PC board pin and bushing mount configurations. It offers an effective electrical angle of 270° ±5° with independent linearity of ±5%, making it suitable for audio equipment, mixing consoles, and other professional control applications requiring sealed, reliable performance.