Lennox 73M00 P3 Plug 318423-701 What is the inner diameter

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a fouled or cracked electrode is a common failure point that leads to "no-fire" conditions or erratic lockouts

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Lennox 73M00 P3 Plug 318423-701 What is the inner diameterThe Lennox 73M00 P3 Plug No Economizer Harness is an essential OEM component designed for specific Lennox commercial rooftop units and furnaces where economizer functionality is not utilized. This LB 98414 harness serves as a bypass or termination plug for the P3 connector on the integrated control board, ensuring the system logic operates correctly without diagnostic faults related to missing economizer feedback. Built to Lennox OEM specifications,