Durable Construction: Heavy-duty copper capillary resists corrosion and fatigue in high-heat zones

making it suitable for a variety of medium-pressure steam systems

It is specifically designed to work with the Honeywell S8610U and related intermittent pilot controls

For Series 93 models

The valve is compatible with chilled or hot water

Lochinvar & A.O. Smith 100109151 Switch 319852-301 Durable Construction: Heavy-duty copper capillaryThe Lochinvar & A. O. Smith 100109151 is a critical safety component designed for high efficiency BTH (Best Tankless Hybrid) water heaters and commercial boilers. This Low Gas Pressure Switch is factory calibrated to a 5" WC (Water Column) set point, serving as a primary sentry to ensure safe combustion cycles. In the field, this switch monitors the incoming gas supply pressure to prevent the burner from firing under insufficient pressure conditions,