The new connector is ONLY for transformers purchased or received after September 1, 2023. This is the new upgraded transformer and this connector will NOT work if you have an original transformer received prior to this date. For any confusion, please contact us directly at email@example.com and we can help you purchase the proper connector. See our other connector, still available for replacement on older model transformers. This is the new male end connector for your blue wire which fits into the new transformer.