the 621931R is the updated OEM replacement relay specifically designed to replace the original 621931 and 6219310 models without any wiring changes

Precise Fitment: Engineered to replace Fasco H8

Nordyne 660153 NAT Pilot Orifice

the 1171306 is the direct replacement for 1177663

York S1-025-38737-000 Limit Switch the 621931R is the updatedThe York S1 025 38737 000 Limit Switch is a critical safety component designed for precise thermal monitoring within York, Luxaire, and Coleman gas furnaces. This automatic reset limit switch is engineered with a trip point range of 140 160F, ensuring the system shuts down the burner if heat exchanger temperatures exceed safe operational limits. As a genuine OEM replacement part, it ensures exact fitment and maintains the original equipments safety