Here is another replica Apollo fitting.
This the the water (coolant loop) connector.
The plugs, (blue pieces) are real, original Apollo suit, coolant connectors. The internal plug, is inserted into the back of the chest mounted fitting (silver, replica part), this is the coolsuit side. The o-ring seal is on this side, as you want the pressure suit sealed when this coolant connector is in, or when the dummy plug is in.
Then the fitting from the PLSS, goes in from the outside. The two plugs have 2 independent channels, one for inlet, the other for coolant outlet, with spring loaded closures. These stay completely independent as the pugs engage each other, and once locked (automatically) into the suit mounted fitting, it provides a path for the coolant to circulate through the coolsuit.