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The MARS 12821 features a standard round diameter that is compatible with most OEM and universal mounting straps
the 0009865 is the upgraded lead free version of the 0821405
Direct Fit: Replaces outdated or failed HVAC pressure switches without the need for modification or field calibration
a valve specifically rated for water (Section IV Water) should be used to ensure correct BTU discharge ratings
Williams P323419 Pilot Assembly The MARS 12821 features aThe Williams P323419 Pilot Assembly is a critical OEM replacement component engineered specifically for Liquid Propane (LP) heating systems. As a veteran grade LP Pilot Assembly, this unit is designed to interface seamlessly with the Williams Forsaire Series, including Direct Vent models (4007, 5507, and 6007) and Top Vent furnaces like the 3508231. This assembly ensures precise gas flow control and stable pilot flame maintenance, which is essential
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