Right, just tapped a 1/8 NPT fitting through the plastic. No more bleeding the bubbles out of the circuit either. I removed the big shut off valve for the NW CSK and capped the reservoir outlet. But, someone could pipe this in after the valve too. The way I have it I can run Engine Ice (snake oil) or just plain water and it can't be mixed with the engine coolant.

Kolevski, sorry for the hi-jack LOL!