How Do I Remove This Cap?

[MrStabby]

The cap in the center appers to be pressed in, so i cant budge it with pliers....

[blind_elk]

It will probably come out the same way as welsh plugs come out (and it will probably be damaged in the process and require replacement).

You need to tap it near an edge so it rotates in the hole. (axis of rotation is the diameter of the hole, not the axis of the hole) - ie punch one side down (into the hole) so that the opposite side comes up (out of the hole).

[Cartman]

heat the rest of the unit, and spray the cap with that ice spray if you dont want to damage the cap