As a high-limit switch

we recommend this OEM -

A stuck sequencer often indicates a compromised internal thermal disk

it features a rugged construction capable of withstanding ambient temperatures ranging from -40°F to 185°F

Versatile SPDT Logic: Enables control of multiple system components through a single 24V trigger

McDonnell & Miller 326950 Junction Box Cover Els PW 17895 As a high-limit switchThe McDonnell & Miller 326950 Junction Box Cover is a precision engineered OEM replacement part designed for field technicians maintaining boiler control systems. This rugged component is specifically built for the McDonnell & Miller 42 and 150 Series low water cut offs and level controls, directly replacing Model Number 150 436. It provides critical protection for internal electrical connections, shielding terminal blocks and wiring from dust,