Quadra-Fire, Heatilator, Pleasant Hearth Vacuum Switch Fits Quadra-Fire Models: ~ 800 ~ 1000 ~ 1100I ~ Castile FS ~ Castile Insert ~ Santa Fe FS ~ Santa Fe B ~ Santa Fe Insert ~ Classic Bay 1200 FS – CB1200 ~ Classic Bay Insert – CB1200I ~ Contour ~ Original Mt Vernon – 4 Spd Control ~ Mt Vernon AE FS ~ Mt Vernon AE Insert ~ Mt. Vernon E2 FS ~ Mt. Vernon E2 Insert ~ Edge 60 Insert Fits Heatilator & Pleasant Hearth Models: ~ Eco-Choice PS35 – PH35 ~ Eco- Choice PS50 – PH50 ~ Eco-Choice CAB50 Part Numbers: ~ Part# SRV7000-531. Replaces all previous Quadra-fire vacuum switches, including SRV7000-166, 812-3430, 812-1990 and SRV7000-447 Specs: ~ Differential Vacuum Pressure Switch, Includes Both Hoses ~ Senses air flow/restriction within the firebox, exhaust chamber, vent pipe and fuel hopper on select models. ~ The vacuum switch runs in circuit with the feed system. If the vacuum switch is faulty or senses a safety issue it will not allow the auger feed motor to operate. ~ Guaranteed HHT/Quadra-Fire OEM Part ~ 90 day manufacturer warranty with our no hassle replacement guarantee ~ Made in the USA