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The McDonnell 150S-M-HD is a genuine OEM replacement head mechanism with snap switch number 172809. This component is designed for use in commercial and industrial low or high-pressure boiler applications. It includes a manual reset feature and Monel bellows to provide corrosion resistance. The product is equipped with snap action switches suitable for high-temperature service, capable of handling a maximum pressure of 150 PSI.
This head mechanism is essential for maintaining efficiency in boiler systems.
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