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One thing to note about the NASA info on LCGs: The NASA LCG uses a relatively high water flow rate (~.5gpm, and 1-2PSI of pressure drop) where the water temperature is varied to control the cooling. The LCG used in the current space suits is basically identical to the final Apollo version. They...

A history of LCGs from a NASA perspective-

The only other commercial supplier of LCGs I know of is CoolShirt, which mostly supplies auto racing folks. https://www.coolshirt.com/ A bunch of the racing suppliers carry their stuff.

There aren't any copyright or restriction notices on the manual, so here is a .PDF

If the connection are the kind Med-Eng usually use, they are from CPC. The little ones between pants and shirt (and hood if you have it) are probably- https://www.cpcworldwide.com/Product-List/Series/5/Valved/1?Category=43 They take a tiny bit of twist and then pull apart. Bigger ones are...

I've got a complete BCS-3a system and I can scan the manual if that would help. It has a battery operated pump and ice bottles. I think I picked it up at a NASA auction. I've also got quite a bit of experience designing, building and testing Liquid Cooling Garments for space, haz-mat...