These are tapered NPT threads, meaning the farther the barb is screwed in, the tighter the fit and seal. Metal expands and contracts, poly tops don't. Metal expands, cracks poly top. Or, barb is screwed in too tightly, cracks poly top. Or a combination of the two.
Moral of story, don't use clear tops. This is roughly the 7th or 8th story I have heard of one leaking or cracking. There are probably many more that have not come forward to post about it. I know I've stated this before, but you can ruin a lot of pretty expensive parts with water leaking from a CPU block.
I would be very surprised to find out that Dtek did not driill and tap the holes properly.
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