What are the primary indicators that this module needs replacement

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How do I ensure a secure connection

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With 1/2 inch ODF connections

Reznor 205444 Pressure Switch 328140-751 What are the primary indicatorsThe Reznor 205444 Pressure Switch is a critical safety component designed for precise combustion air monitoring in high efficiency gas fired systems. Factory set at 0. 30" WC (water column), this SPST (Single Pole Single Throw) switch ensures that the inducer motor is generating sufficient vacuum before allowing the ignition sequence to proceed, preventing unsafe operation due to vent blockages or motor failure. As a genuine OEM Reznor replacement