Hot Surface Igniter Kit - 120V - Silicon Nitride which is more durable and longer lasting than silicon carbide - Designed to replace Lennox/Ducane/ComfortAire, ect. For furnaces, unit heaters, boilers and hot water heaters - Will replace several hot surface ignitors. Includes igniter & attached plastic terminal connector. Made by Supco. Please see below list and picture of hot surface igniters this kit replaces. 

Replaces:

SSN21--FURNACE IGNITER - EXACT REPLACEMENT

The 75M21 Igniter is used on Lennox® furnaces.

Replacement Part:75M21
Part Description:
Manufacturer :Lennox®

Replacement Part:483396
Part Description:
Manufacturer :Coorstek®