Trane KIT16585 Conversion Kit 322838 753 This SPST (Single Pole Single This SPST (Single Pole Single Throw) air pressure switch is designed to monitor vent pressure and ensure the inducer motor is moving sufficient combustion air before allowing the ignition sequence to proceed providing a reliable solution for maintenance professionals looking for OEM HVAC replacement parts that match original factory specifications without the need for field modifications the KIT16585 is the industry standard for field ready repairs this kit transitions your system from a discontinued variable speed motor to a robust 3 phase inducer (BLW00879) platform