this SPDT pressure switch is calibrated to a specific setpoint of -

This relay is commonly used in fan coil units to switch between high and low blower speeds or to energize auxiliary electric heat strips

never downsize a voltage rating

Standardized Terminals: Equipped with 1/4-inch quick-connect terminals for standard technician lead sets

Weil McLain 383-500-251 Gasket/Insulation Els PW 17895 this SPDT pressure switch isThe Weil McLain 383 500 251 Cover Plate Gasket Insulation is a critical OEM replacement component designed to maintain the pressure vessel seal on high efficiency Ultra Gas Boilers. This specific part is the manufacturer designated direct replacement for the legacy 591 200 000 model, ensuring a precision fit during routine heat exchanger teardowns or burner maintenance. As a veteran grade boiler replacement part, this combustion chamber insulation