Viessmann 7819971 Air Vent 318820-201 The York S1-025-26390-001 limit switch

The York S1-025-26390-001 limit switch is a critical safety component designed for precise thermal regulation within residential gas furnaces

Precise Thermal Protection: Set at a 145-150F temperature range to prevent critical overheating of the heat exchanger

The McDonnell & Miller 47 serves as a reliable mechanical water feeder specifically designed for low-pressure steam and hot water boilers

Durability: Features high-grade elastomers designed to withstand rigorous industrial fluid temperatures and cycles

Viessmann 7819971 Air Vent 318820-201 The York S1-025-26390-001 limit switchThe Viessmann 7819971 Air Vent with Shut Off Base is a critical component for maintaining hydraulic stability in high performance condensing systems. Engineered specifically for the Vitodens series, this G3 8" automatic air vent facilitates continuous air elimination from the primary heat exchanger loop, preventing airlocks that compromise heat transfer and cause circulator cavitation. This OEM part is the direct replacement air vent for Viessmann