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Originally Posted by pHaestus
I suspect that, over time, the neoprene top on the nozzles lets some water through (bypassing the nozzle). I know I saw flow rates that were higher the next day than the night I changed nozzles and set up loop. I also know the neoprene is very dense and compressed when you pull it out.
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Yes - that could be a concern. I hadn't thought about it, but the neoprene will continue to compress to let more water through an area where it has developed a leak. The more restrictive the nozzles, the more quickly and more prominent this behavior will be.
I remember a silly thing I once did. I stuck a TEC onto my GPU. The cold-plate + TEC was clamped independently to the water block. I had some neoprene foam get caught in-between the back mounting plate and the video card though when I attached the setup to the GPU. Initially it was on very tight. After a few days my video card started producing artifacts, which got steadily worse, and then it was even happening at stock speed. Took the card out and looked at it and the stuck foam had compressed so much that the coldplate was barely touching the GPU. Learned a valuable lesson then about neoprene being the basis of any pressure point.