Replacement Manual Reset Snap Disc # 2 (Older) for Quadrafire & Heatilator Eco-Choice Pellet Stoves. 175 Degrees. This part is also know as a thermodisc or snap switch. Click on the photo to enlarge and view other angles. Fits the following models: Quadrafire Pellet Stoves: Castile FS (Pre serial # 0071195663) Castile Stove (Pre serial # 0071195663) Contour Santa Fe (Pre serial # 0071642320) Heatilator Eco-Choice Pellet Stoves: PS35 PS50 CAB50 Part # SRV230-1960