Replacement manual reset snap disc #3 for Quadra-Fire and Heatilator Eco Choice pellet stoves. This part is also known as a thermodisc or snap switch. 
Quadra-Fire Pellet Stoves:

• Edge 60 Zero Clearance Fireplace
• Mt Vernon
• Mt Vernon AE
• Mt Vernon AE Insert
• Contour
• Santa Fe
• Santa Fe Insert
• Classic Bay 1200i Insert
• Classic Bay 1200
• Castile
• Castile Insert (This is the #2 and #3 for this stove)
• Trekker
• Trekker Insert

Heatilator Eco-Choice Pellet Stoves:

• PS35
• PS50
• CAB50

Quadra-Fire part # SRV230-1290
Replaces old part number 812-3650