The rugged alumina ceramic insulator prevents voltage tracking

While it is a 3-pole relay

and 700 series models

NM/AM series require larger K-AM25 or K-NM20 equivalents

Lochinvar & A.O. Smith 100161835 Valve mario The rugged alumina ceramic insulatorThe Lochinvar & A. O. Smith 100161835 Air Metering Valve is a critical component for maintaining the precise combustion air to fuel ratio in high efficiency condensing boilers and water heaters. Engineered for exact modulation, this venturi air valve ensures the burner receives the correct airflow required for stable ignition and optimal thermal efficiency. It is a direct OEM replacement part designed to interface seamlessly with the blower assembly