4 Pins Potentiometer (Replacement)
It seems almost certain that you are looking for a &quot;center tapped potentiometer&quot; If you search using that term, you should be able to find a replacement. It seems likely that the pictured pot is 5K ohms. You may or may not be able to use a different value. You can not find the correct value, you could try a different value and see what happens. Trying 10K rather than 1K would seem to me to be the safest thing to try if you can not find 5K.