Thermocouple Cover, by Quadrafire 812-4920 (aka 812-1322)
Quadra-Fire Pellet Stove Replacement Thermocouple Cover. Part #812-1322 Fits Quadra-Fire Pellet Stoves and Inserts: Mt. Vernon Original (Non-AE) CB1200 Pellet Stove Insert Castile Pellet Stove Insert, SantaFe, Contour