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Ugly...it took numerous emails, photos and posts to get syscooling to offer to replace one of my first two pumps which is leaking/non-functional. They said a day or two ago that they would "arrange shipping". To date, they have not contacted me with any sort of tracking number or other confirmation that they have actually mailed a replacement pump. One 1TH/s miner has now been down for a week. This coupled with the fact that I was also unlucky enough to receive one of the version 1 harnesses with a short which fried a fan header on one of my first C1s has left me with a very poor opinion of syscooling.com and I have to question BitMainTech's choice of partners.
You can use one pump for two miners. My one set of C1 works from the beginning only with one pump, two miners, two radiators. Another pump was D.O.A. There is no replacement sent for syscooling and I've been "too lazy" to leave them negative feedback..
I'm still waiting a bit.