Draining water loop

I put the hose from a vacuum pump into the top of the res and suck it out, then unplug one of the hoses form the res and plug it into the vacuum pump hose and suck out the rest of the system.

Pump cost £5 off a popular auction site bout 3 years ago, ive used it for loads of things this being the latest thing its useful for :)
 
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