Professionals typically utilize this kit for the F80CSU

This beige metal thermostat guard features a robust heavy-duty steel enclosure with a 22-gauge frame and an 8-gauge cover

which typically indicates stiffening or micro-perforations in the diaphragm material

direct heating to the oil reservoir

effectively preventing hazardous unburned gas accumulation by signaling the gas valve to close when no flame is detected

Heil Quaker ICP 1005161 Cover 340155-7026 Professionals typically utilize this kitThe Heil Quaker ICP 1005161 Cover is a critical OEM component designed for specific oil housing S assemblies within oil fired furnaces and burners. As a genuine International Comfort Products (ICP) replacement part, it ensures a factory grade seal to prevent fuel leakage and maintain internal pressure across residential heating units. This structural cover is a direct fit for several Heil, Tempstar, and Arcoaire models, including legacy 867. 741474