Aprilaire 8029 Plugin Transformer 321042 401 Ensure your system remains within Ensure your system remains within safe operating parameters by verifying this component during routine maintenance or after a leak repair on older R 22 equipment Technical Compatibility: Integrated hub with a 1 2" bore size and intake side mounting makes it compatible with both standard condenser fan motors and legacy units product data and specifications are subject to change The Aprilaire 8029 Plugin Transformer is a high performance electrical component designed to provide a reliable 24 VAC power supply for advanced HVAC accessories and communication panels