Advanced Contact Reliability: Features gold-plated electrical contacts specifically designed for dry circuit applications and low-energy signals

Its high-grade brass construction resists dezincification and corrosion

and specific series of Lochinvar Copper-Fin boilers

this is an OEM part for the Nordyne family of brands

Stable Performance: Utilizes a 10K ohm Type II thermistor to deliver precise temperature data back to the controller

McDonnell & Miller 53-HD Control 30067439-890 Advanced Contact Reliability: Features gold-platedUpgrade or restore your boiler's mechanical water feeder with the McDonnell & Miller 53 HD Head Mechanism. Designed specifically for low pressure steam and hot water boilers, this heavy duty Series 53 replacement part (Part Number 137000) provides proportional feed action to maintain safe water levels in systems larger than 5,000 sq. ft. As a head mechanism only, this unit allows for a direct swap onto your existing float chamber without needing to