Well this is interesting. GamersNexus has about a twenty minute video (and a couple-page editorial) where they disassemble an Asetek / EVGA liquid cooler for GPUs. He spends the first half of the video with a discussion of previous videos, an overview of the industry and its split between vendors and manufacturers, and an explanation of various components including the difference between CPU and GPU plates. The second half of the video disassembles the cooler, talking about it as he goes.
The disassembly begins at ~9 minutes.
The availability of closed-loop coolers introduced me to water cooling. While I could be very careful to do everything right, I just don't trust myself to assemble a liquid-filled (non-conducting or otherwise) component that close to electronics. Part of that could be attributed to my childhood, where a dead PC meant no computer for x number of weeks, or months, because we could barely afford one at all. An assembled (and warrantied) cooler, though, while still intimidating when the tubes get even slightly torqued, is clearly designed to go in hassle-free and remain working without maintenance. That's a good part of why, while it's pretty obvious what is inside these units, seeing it first-hand is fascinating (at least for me).