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[chillyhiker]

Speed I have a question...the valve in the picture..is that to bleed off any air that might get trapped in the line?

[slimjim]

EXACTLY

[Speed]

Yup, that is the high point in that loop, figured it would be handy. I also have a female/ female fitting for it so I can hook a garden hose on it if I want. I used it to fill that loop after install. I was able to push water back to boiler on both lines by alternating supply and return valves open and closed. Worked good, too, I had no air trapped in that loop when I started it. Looking back, I should have done that on the house side, too, instead of filling loop from return line. But that worked fine also.