Flow switch connection to PCB

[swope1221]

Hi all. I need to replace the flow switch on my hawyard hp50ha2 heater. I have the new flow switch, and see where it connects to the pcb board. My question is how do I release the wires currently connected? Not sure if it is a spring release of some sort, certainly not a set screw. I'll attach a picture of the connection type, it would be the gray ones on the front and left of the picture. Thanks in advance.

Eric

 

[swope1221]

I think I figured it out. Looks like I push down to release the wire, and then release to hold the wire. Seems like the same principle as the clip on a drawstring bag.