The 803112601 features a standard 1/4" NPT bottom inlet for the gas connection and a 1/8" NPT vent

making it the primary power supply for integrated ignition modules

critical for systems relying on tight head pressure control and electronic expansion valve (EEV) modulation

The ASCO 8210G11 is pilot operated

Lochinvar & A.O. Smith 100166248 Pressure Switch 321894-706 The 803112601 features a standardThe Lochinvar & A. O. Smith 100166248 Pressure Switch is a critical safety component designed for precise combustion air proving in high efficiency commercial boilers and water heaters. Rated at . 95" WC (Water Column), this SPDT (Single Pole Double Throw) switch monitors differential pressure to ensure the blower is moving sufficient air before the ignition sequence begins. This authentic OEM replacement part is the current manufacturer specified