Williams P321826 Limit Switch you should source the T-4000-3144

you should source the T-4000-3144 or T-4000-3145 to ensure the window and logo orientation remain correct

the plunger is responsible for the precise mechanical travel that balances hot and cold water streams

Leak Prevention: High-grade 1" O-ring and precision-molded rubber ball restore the bubble-tight shut-off required for efficient zone control

you must verify the number of internal switches and the specific load ratings

Williams P321826 Limit Switch you should source the T-4000-3144The Williams P321826 Limit Switch is a critical safety component designed specifically for Monterey Counterflow Top Vent Furnaces, including the 250, 350, and 500 series. As a veteran technician knows, maintaining the integrity of the vent safety shutoff system is non negotiable for preventing flue gas spillage and potential carbon monoxide hazards. This replacement vent limit switch is engineered to monitor exhaust temperatures and will break the