It is applicable to devices manufactured before 2017. Please see clearly that the device is AC12V
In addition, this power transformer can also be used for other equipment requiring 12VAC 300mA, 400mA, 500mA, 650mA, and the input is 120VAC.
12 Volt Soft Water Supply for the Clack control valve, WS1 AC Adapter 120 volt 12 volt pn V3186 - V3186 clack Transformer
This is a replacement part. Its appearance is different from the original version, but its function is completely consistent with your device.
It is applicable to devices manufactured before 2017. Please see clearly that the device is AC12V