Lennox 17F50 Header Box Kit 320074-702 As part of the SmartX

As part of the SmartX MX41-7xxx series

While you can technically use a 3-pole contactor in place of a 2-pole unit by utilizing only two of the poles

This assembly is specifically rated for low-pressure steam systems up to 15 psig

a specific regulator spring kit must be used

This is a 2-pole (2PNO) contactor

Lennox 17F50 Header Box Kit 320074-702 As part of the SmartXThe Lennox 17F50 Cold End Header Box Kit is a critical OEM replacement part designed for high efficiency 90% AFUE and above condensing gas furnaces. As a primary collector box assembly, this kit manages the corrosive condensate generated during the heat exchange process, preventing fluid backup that can lead to pressure switch trips and furnace lockout. This heavy duty header box kit (Lennox 619598 46) is engineered for a precise fit on EL296, ML195,