Help ID Connector - 4 Pins

[ReedTriesToRepair]

Wasn't sure what other category this question would fit in, so I put it here.

This connector (pictured) came on the back of an ultrasonic power supply and is what is used to connect the probe. I've never seen a connector quite like this before. The plug is recessed about 10mm into the hole. Anyone seen anything like this before? I want to buy the male end to mate with it so it looks as professional as possible (I'm currently sticking jumpers into the holes, not a permanent solution).

If it matters, the generator is a Sonics Vibra-Cell VC70.

[thm_w]

Can you measure the diameter of the inside circle of the black part of the plug?
It looks a bit like this but they don't do 4 pin: https://www.ultimateconnector.com/products/circular/micro-circular/micro-circular-solderable

Worst case if its not easily purchasable you can make a PCB with some soldered in pins, and glue or 3D print a housing.