What is the bore diameter for the shaft attachment

and the outdated 1370905

This control is specifically engineered for Rheem-Ruud RKKA

eliminating field modifications

York S1-031-09179-000 Board 30067439-890 What is the bore diameterThe York S1 031 09179 000 24V Relay Lock In Board is a critical control component designed for precise sequence management in commercial and residential HVAC systems. This genuine OEM part serves as the direct replacement for S1 031 09155 000, addressing common communication failures and relay chatter issues found in older board revisions. Operating on a standard 24V AC control circuit, this board functions as a lockout relay, preventing short cycling