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The Goodman 20197308 Pressure Switch is a genuine OEM normally-open (NO) draft-proving switch for the GMV950453BXBA two-stage variable-speed gas furnace. It closes at -0.10 in WC to confirm adequate inducer draft or blocked-drain status before allowing the ignition sequence to proceed, protecting against unsafe combustion conditions.
OEM vs. Generic: Setpoint accuracy is critical — this switch is part of the furnace safety chain. The OEM 20197308 is calibrated to the exact -0.10 in WC trip point specified for the GMV9 platform. A generic switch with a drifted setpoint can cause nuisance lockouts or, worse, fail to detect a dangerous condition.
Install difficulty: Easy (2/5). Disconnect power, transfer the wiring and pressure hose to the new switch, and mount it in the original orientation. Confirm it proves on a call for heat. Verify with a manometer if available.