I've been using EK waterblocks for years, so I'm sure this is an isolated case, but if it happens once it can happen again and I'd hate to see someone's parts fried.

I took delivery of a bunch of WC stuff this morning (so about 14hrs ago), including an EK Classified FC block (nickel/delrin). Spent most of today setting up the loop, mounting the blocks, etc, then (thank God) did a quick leak test and within minutes got a soaked motherboard - since there was no power to the board at the time it's probably fine, but I'm not sure yet. I swapped out the delrin "TOP" bridge with the red acrylic one, so I thought that might be the problem, so I pulled it off, applied Vaseline, made sure it was all tightened down - still leaking. Next thought it might be the classic BP O-ring problem, swapped out for some Swiffy O-rings on the fittings - still leaking.

To cut a long story short, I changed practically everything in my loop, then, at my wits end, pulled apart the EK FC block (not thinking there'd be a problem as I hadn't touched it other than changing over the top bridge), and was unpleasantly surprised - there were no O-rings in the block other than one in the "TOP" bridge section. The block should have three - one in the PWM section, one in the "TOP" bridge between the two sections, and one in the NB/SB/NF200 section. I only have the one. No wonder the thing was leaking. As the box was still sealed with the "Factory sealed" stickers across all the edge, this is clearly a problem at the source, so please folks, check your EK waterblocks to make sure they've actually got O-rings inside them.

As it's now about 1:00AM for me, I can't do anything until tomorrow but I really, really don't want to ship the block back to the reseller - they're on the other side of the continent from me so that'll be about a weeks shipping there and back, plus expenses etc. Accordingly, can someone who has the EK Classified FC block please give me the measurements of the O-rings used in the NB/SB and PWM sections of the block so I can try and find an O-ring to suit in a hardware store? Much, much appreciated if anyone can help out - I'm kind of stuck right now.

And Eddy, if you're reading this, check your QC - this nearly cost me a $600 mobo.