By the way, leaking from the little impeller pumps on the head sinks is common. Both my Monarchs started doing that within 3 weeks of receiving them. On was really subtle and the miner overheated before I noticed it was leaking. There are multiple reasons for this the main one being that BFL used a super-cheap cooling solution. If the system gets even slightly too warm the pump body deforms and the skinny o-ring that seals it ceases to function. You can make it last longer by swapping with a larger-diameter o-ring, but that is a temporary solution. Also the pump controller, if you should remove it, is virtually impossible to re-seat due to the super-skinny wire that completes the circuit.
What I ended up doing on the one that leaked and didn't overheat, was to disassemble the impeller pumps cooling the chips. I threw out the impeller and replaced the skinny o-ring. I resealed the pumps, which are now just passive chambers for the water to flow through.
Then I got a cheap Syscooling pump (similar to the Antminer C1 contraption) and connected it between the two ex-pumps and the radiator. Voila! No leaks. Avg 3 deg C lower temps than the stock cooling solution.
The hose barbs are likely to be different diameters so plan for some way to reduce one end. However I found that jamming a cold 5/16" poly hose into a warm 3/8" poly hose creates a perfect seal. You can't pull it apart once the temps equalize. But I put clamps on just to be sure.
