Carrier 330539-757 Coupling Box 320788-703 making it a drop-in solution

making it a drop-in solution for Lennox and other major OEM equipment

Snap Action Reliability: Mechanical snap action switch prevents "chattering" and arcing

and Heating

Is the A17418 kit compatible with both liquid and suction line valves

Carrier 330539-757 Coupling Box 320788-703 making it a drop-in solutionThe Carrier 330539 757 Coupling Box is a critical OEM replacement component designed for 40 inch tall condensing gas furnaces. This genuine furnace coupling box kit replaces older ICP part numbers, including 320721 768, ensuring a precise fit and restoring the factory standard seal on the secondary heat exchanger. For technicians working on Carrier, Bryant, or Payne furnaces, this kit is essential when addressing common moisture or combustion air