The York S1-025-27792-009 is a critical safety component designed for precise thermal monitoring in high-efficiency gas furnaces

or wavering pilot flame

and solid debris

Hand-tighten the adapter into the check valve before using a wrench for a final quarter-turn to seat the internal gasket

providing the reliable moisture and solid contamination control required for precision HVACR and pneumatic controls

Functional Devices RIB2402B Relay The York S1-025-27792-009 is aThe Functional Devices RIB2402B Relay is a heavy duty, 20 amp enclosed power relay designed specifically for the rigorous demands of HVAC control systems and industrial automation. Built with a SPDT (Single Pole Double Throw) configuration, this "Relay in a Box" (RIB) provides a reliable interface between low voltage controllers and high voltage loads. It features a multi voltage coil that accepts 24VAC DC or 208 277VAC, eliminating the need for